How to choose a memory card for a tablet

Using an SD memory card as internal memory

Before proceeding with the setup, transfer all important data from your memory card somewhere: in the process it will be completely formatted.

Further actions will look as follows (instead of the first two items, you can click on “Configure” in the notification that a new SD card has been detected, if you have just installed it and such a notification is displayed):

  • Go to Settings. Storage and USB drives and click on the “SD card” item (On some devices, the storage settings item can be found in the “Advanced” section, for example, on ZTE).
  • In the menu (button on the top right) select “Configure”. If the menu contains the item “Internal memory”, immediately click on it and skip item 3.
  • Click “Internal Memory”.
  • Read the warning that all data on the card will be deleted before it can be used as internal memory, click “Erase and Format”.
  • Wait for the end of the formatting process.
  • If at the end of the process you see the message “SD card is running slowly”, this indicates that you are using a Class 4, 6 memory card, etc. really slow. It can be used as internal memory, but this will affect the speed of your Android phone or tablet (such memory cards can work up to 10 times slower than regular internal memory). It is recommended to use UHS Class 3 (U3) or at least U1 memory cards, about ordinary Class 10 cards your phone may tell you that they are not fast enough.
  • After formatting, you will be prompted to transfer data to a new device, select “Transfer now” (the process is not considered complete until the transfer).
  • Click Finish.
  • It is recommended to restart your phone or tablet immediately after formatting the card as internal memory. press and hold the power button, then select the “Restart” item, and if there is none. “Power off” or “Turn off”, and after turning off. turn on the device again.

This completes the process: if you go to the settings “Storage and USB drives”, you will see that the space occupied in the internal memory has decreased, on the memory card. increased, and the total amount of memory has also increased.

However, in the operation of the function of using the SD card as internal memory in Android 6 and 7, there are some peculiarities that may make the use of such a possibility impractical. about this the corresponding section of the manual.

Formatting a memory card for use as internal storage in ADB

For Android devices where the function is not available, for example, on Samsung Galaxy S7-S9, Galaxy Note, it is possible to format the SD card as internal memory using ADB Shell.

Since this method can potentially lead to problems with the phone (and it may not work on any device), I will skip the details on installing ADB, enabling USB debugging and running the command line in the adb folder (If you do not know how to do this, then. perhaps it is better not to take it. And if you do, then at your own peril and risk).

The necessary commands themselves will look like this (the memory card must be connected):

  • adb shell
  • sm list-disks (as a result of executing this command, pay attention to the issued disk identifier like disk: NNN, NN. it will be required in the next command)
  • sm partition disk: NNN, NN private

After formatting is complete, exit the adb shell, and on the phone, in the storage options, open the “SD card” item, click on the menu button in the upper right and click “Transfer data” (this is mandatory, otherwise the phone’s internal memory will continue to be used). At the end of the transfer, the process can be considered complete.

Another possibility for such devices, if root access is available, is to use the Root Essentials application and enable Adoptable Storage in this application (a potentially dangerous operation, at your own risk, do not perform on older versions of Android).

Features of the memory card as an internal memory of Android

It can be assumed that when an M memory card size is attached to the Android N internal memory, the total available internal memory should become equal to NM. over, approximately this is displayed in the information about the device storage, but in fact everything works a little differently:

  • Everything that is possible (with the exception of some applications, system updates) will be placed on the internal memory located on the SD card, without giving a choice. But the internal memory continues to be engaged: not all data and not all applications can be placed on the SD card.
  • When connecting an Android device to a computer, in this case, you will “see” and have access only to the internal memory on the card. The same goes for file managers on the device itself (see Best File Managers for Android).

As a result, after the moment when the SD memory card began to be used as internal memory, the user does not have access to the “real” internal memory, and if we assume that the device’s own internal memory was larger than the MicroSD memory, then the amount of available internal memory after of the described actions will not increase, but decrease.

Another important feature. when resetting the phone, even if you removed the memory card from it before resetting, as well as in some other scenarios, it is impossible to recover data from it, more about this: Is it possible to recover data from a formatted SD memory card like internal memory on Android.

How to format SD memory card as internal memory (example for Android 9.0)

On the latest version of Android, all the steps for converting a MicroSD memory card into an internal one are almost the same, but just in case, I will describe the steps separately and give screenshots (do not forget that all data from the memory card will be deleted in the process, take care of saving important files) :

  • On your smartphone go to Settings. Storage. And then click on the item “SD card”.
  • Click on the menu button in the upper right, select “Storage settings”, and on the next screen. “Internal memory”.
  • Read carefully what will happen and, if you agree, confirm formatting the memory card as internal memory. Wait for the process to complete.
  • To transfer data (those that can be transferred) from the internal memory to the SD memory card, open the menu in the storage options and select “Transfer data”.

This completes the procedure. All the features of operation and the method of returning the memory card to the mode of operation as a portable storage remain the same as for previous versions of Android.

SD card as Android internal memory

If your phone or tablet on Android 6.0, 7 Nougat, 8.0 Oreo or 9.0 Pie has a slot for connecting a memory card, then you can use a microSD memory card as the internal memory of your device, this feature first appeared in Android 6.0 Marshmallow.

In this manual. about setting up an SD card as an internal Android memory and about what restrictions and features are there. The process is shown first for 7.0, then for the latest version of Android 9. Please note that some devices do not support this function, despite the required version of Android (Samsung Galaxy, LG, although there is a possible solution for them, which will be given in the material). See also: How to clear internal storage on Android phone or tablet.

Note: when using the memory card in this way, it cannot be used in other devices. i.e. take it out and connect it via a card reader to a computer (more precisely, about Honor data) only after full formatting.

How to restore normal operation of a memory card

If you decide to disconnect the memory card from the internal memory, it’s easy to do. transfer all important data from it to the computer, then go, as in the first method, to the SD card settings.

Then, in the menu of actions with the memory card, select the item “Portable media” and, following the instructions, format the memory card.

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I combined the SD memory with the internal one, everything worked for 3 weeks. Today, when the camera starts, it says “insert the CD drive to start the camera.” What to do in this situation?

Can I enter the camera settings? If yes. then there change the location of saving the photo to the internal memory.
If not, try clearing the cache and data of the Camera application (just in case, save the photo beforehand).

Hello, how to make a memory card internal storage on Android 8.8.1 ?
Huawei / Honor

on net 8 is exactly the same as shown. But I don’t know if the Huawei / Honor function is supported and, in theory, their interface and paths in the settings may differ somehow.

Please tell me why I can’t install applications, I combined the memory card with the phone’s memory as in the article, but the phone says that there is not enough memory when installing any application.

Combining does not particularly increase memory if you have a memory card that is the same size as the internal one (or less) and if the internal one is in fact crammed to capacity, there may be such errors. Well, some applications can only be installed in the “real” internal memory.

I have the 9th Android-J3 of 2017, when I go to the memory card, there is no internal memory item, and after formatting, the choice of the parameter how to use the flash drive does not appear either (just the flash drive is ready to use), what to do.

Samsung does not have this function.

Hello! after formatting, the choice of the parameter how to use the USB flash drive does not appear

Formatted the card using ADB- and still not used as internal memory, and there is no button for internal memory, just remove and format! phone Samsung J3 2017.

I successfully combined the memory of the card and the phone, but something went wrong and now I have all the functions related to memory working by 8 percent. I don’t even understand what to do in this situation.

And what does it mean “work by 8 percent”?
Well, as a last resort, you can format it back as a portable drive.


When buying memory, give preference to those manufacturers that provide a guarantee. The optimum is a guarantee of work from 5 years.

Thus, when wondering which memory card to choose for a tablet or other gadget, first study the characteristics of your device. Then you can choose the appropriate type and size of the card.

How to choose memory for your phone: unknown characteristics of memory cards

The first modern format memory cards appeared a little more than 20 years ago. And with the advent of smartphones, tablets, cameras and other gadgets, these phone accessories have become almost indispensable. Modern memory cards have a number of characteristics that you need to pay attention to when choosing them.


The most popular format, which is used in almost all smart technology, is an SD card with a size of 32 × 24 × 2.1 mm. Its improved version is the SDHC card, which has more memory capacity. Almost all modern cards that have more than 4 GB of memory are of the SDHC type.

Even more advanced is the SDXC type with up to 2 TB of storage. Of course, many smartphone owners are tempted to purchase a card with as much memory as possible. But it should be understood that gadgets working with SDHC accept the older SD format, but not vice versa. In this case, if you need to store huge amounts of information, you can get an external hard drive. For more information on how to choose an external drive, follow the link. SD cards come in several different sizes. For example, miniSD with dimensions 21.5 × 20 × 1.4 mm and microSD with dimensions 11 × 15 × 1 mm.

There are also other memory formats such as CF, MMC, Memory Stick. They mostly have a specific scope of use and are not suitable for smartphones.

Choosing a memory card: useful tips and tricks

Thousands of photos, music from your favorite artists, vacation videos, films and audiobooks. all this takes up a lot of space. But there is nothing to remove. everything is too valuable to part forever. In such a situation, the memory card will be a lifesaver. It would seem that it could be easier than buying a memory card for a smartphone or tablet. decided on the volume, found a cheaper offer and the job was done. But not everything is so simple. It is because of this approach that many are faced with the problem of braking or freezing the gadget after installing a memory card. Not all, of course. Maybe you’re lucky. The fact is that memory cards come in different standards and classes, which is reflected in their work with a certain gadget. For example, the same memory card for a Samsung smartphone would be an ideal option, but would not want to work with a model from another brand at all.

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How to choose a memory card for a phone or tablet? What to look for when choosing memory so that the gadget does not lose its functionality? We will find the answers to these questions further.!

Speed ​​classes

One of the main parameters of memory cards is the speed of information exchange. The higher the speed, the faster you can save photos, videos, play dimensional audio and video files without braking the gadget.

There is a unified classification of memory cards depending on the minimum write speed. SD Class 2, SD Class 4, SD Class 6, SD Class 10, etc. The number near the name means how many MB per second the card can transmit / receive.

How to deal with memory so that its life is much longer?

Modern memory cards are practically “eternal” external drives and can easily withstand from 10,000 to 1 million records. Of course, like any other electronic device, a memory card can fail for a variety of reasons. The following simple guidelines will help you extend the life of your memory card:

  • Do not expose the card to shock or shock;
  • Avoid getting moisture on the card. Although many modern memory cards boast moisture resistance, it is better not to expose the device to such a risk once again;
  • Avoid sudden and significant temperature changes;
  • Perform low-level card formatting from time to time.

Follow these simple tips, and you will not have to worry about a sudden card breakdown and loss of all data. Since you can choose a memory card for a tablet that suits it as much as possible, but neglecting the rules of operation, very soon you will have to choose a new one.

How to choose a memory card for an Android smartphone or tablet?

In most Huawei devices, memory expansion is possible thanks to microSD memory cards, in addition, the Emotion UI capabilities allow you to programmatically swap the memory card and device memory without limiting the multimedia capabilities of your phone or tablet.
In this article, we will tell you how to choose a memory card for your Android smartphone or tablet that will suit your needs. At the same time, your smartphone or tablet does not have to be made by Huawei, the information presented in this article is relevant for choosing a memory card for a device of any manufacturer.

The description of each device contains a parameter that shows how much more memory cards can be used with it. This parameter can have the following values:

  • microSD. it is possible to install memory cards up to 4 GB inclusive (as a rule, this is found in relatively old devices);
  • microSDHC. it is possible to install memory cards up to 32 GB inclusive; (supported by most Huawei devices);
  • microSDXC. you can install memory cards up to 2 TB inclusive. The most common. 64GB, memory cards of this size are supported by most top Huawei devices.

So, we touched on the issue of the maximum size of microSD memory cards in our devices. But in addition to size, memory cards are also classified by data writing speed. This parameter is called the class of the card and is shown on the packaging and on the memory card itself. For regular karts, the speed class is indicated by a number inside a letter C. For UHS cards, the speed class is indicated by a number inside a letter U.

At the moment, the following classes of memory cards are the most common:

  • microSD class 2 (writing speed 2 Mb / s). it includes relatively inexpensive, and, accordingly, the slowest memory cards currently on the market. They will suit you in many ways if you plan to listen to music, view images, but do not plan to do burst shooting or high-definition video recording.
  • microSD class 4 (write speed 4 Mb / s). average speed level, not subject in most cases to performance delays in both multimedia and games.
  • microSD class 6 (write speed 6 Mb / s). high level of speed, optimal for a wide range of tasks, including replacing the internal memory of the device.
  • microSD class 10 (10 MB / s write speed) is the highest of the widespread classes of SDHC cards. Recommended in situations requiring increased write speed from the device.
  • microSD UHS Speed ​​Class 1 (U1) (write speed up to 10 Mb / s). high-speed cards for recording large data streams.
  • microSD UHS Speed ​​Class 3 (U3) (write speed up to 30 Mb / s). high-speed cards for recording video files in high quality Ultra HD 4K. The use of these cards in smartphones is impractical due to the high cost.

Based on these recommendations, you can more accurately choose a memory card of the required size for your Huawei device, having decided on the price range and technical requirements.

Memory card. What is it?

Typically, the memory card is a small black rectangle, but sometimes the appearance is different. Depending on the model, it has a different amount of memory. In modern models of various gadgets, only one type of memory card is used. microSD, although there are quite a few of them.

Earlier, when mobile phones were just beginning to acquire additional memory, each manufacturer tried to invent its own format, different from the others. For example, the memory card of an LG phone could not be inserted into Nokia in any way. Over time, this trend, as well as specific charging connectors, gradually faded away. This has its own plus, because after changing the smartphone, now it is not at all necessary to re-purchase this important accessory for it.

How to determine the manufacturer

In fact, there is not much difference between memory cards from different manufacturers. They are all quite reliable, so only the price or attractive appearance can become the final weighty argument when choosing. The speed of the card, as discussed above, depends only on its class.

Sometimes on old devices there is a situation when memory cards of the maximum volume for a gadget do not work from all manufacturers. What is the reason, even the developers of this or that gadget cannot answer. For example, a similar question was previously discussed on the forums. an ordinary memory card was bought, the ZTE phone did not see it point-blank, although it worked without problems with other devices. Therefore, when buying a memory card, it is best to take with you the device for which it is intended. Thus, you can avoid unnecessary stress associated with the return of an unsuitable accessory.

What class of memory card do I need?

Let’s take a look at what a memory card of each class can be used for. This will be another step towards how to choose a memory card for your phone and not be mistaken.

  • Class 2 memory cards are designed for data storage and are the slowest and cheapest option. They can record music and video files, while the recording process itself will be quite lengthy. Problems may occur when watching high definition videos.
  • Class 4 memory cards are the most popular and widespread. Fully meet the high-speed multimedia needs of budget phones and smartphones. Nevertheless, it is better not to use it for games and programs.
  • Class 6 memory cards. can already be a replacement for the internal memory of some electronic devices and are designed to record and store all types of files.
  • Class 10 memory cards are the fastest type of cards, the maximum capabilities of which can be used by any smartphones. Allows you to record high-definition video and perform other tasks that require high-speed recording of information.
  • U1 class memory cards. are an improved class 10, slightly faster write speed and significantly faster reading, as a result of which they can be used for program files, since they will load much faster.
  • U3 memory cards are very rarely used, as their characteristics are required only when recording video in 4K resolution, and the cost is very high.

What is a memory card class

In fact, everything is clear with digital classes. a four is equal to a write speed of up to 4 MB / s, and a dozen. up to 10 MB / s, respectively. With the U1 class, it is a little more interesting, since the manufacturers promise the speed not up to, but from 10 MB / s, but what the maximum possible will be, you have to check on the spot. This class is considered a newer standard, and the SD memory card marked with it differs for the better from its predecessors.

In addition to the above, there are also digital classes SD Card 2 and 6, as well as a new generation class U3. Digital are no different from their predecessors, that is, they correspond to the maximum write speed in the same way. The U3 class is currently considered the highest and allows writing information at a speed of over 30 MB / s. But, despite the high level of development of smartphones, so high speed is not yet needed by any of them, so we will not consider it in detail.

How to choose a memory card for your phone? SD Card

The amount of information required for work and play is increasing every day. The quality of photos and video files increases, and with it their “weight” grows. As a result, the built-in memory of our gadgets, especially from the budget segment, is sorely lacking. This problem is easily solved, especially in phones with a removable battery. Why exactly in them, how to choose a memory card for a phone for any budget and many other questions will be discussed in this article.

What is the maximum memory card size supported by the device?

Often, most manufacturers themselves indicate in the characteristics of a phone or smartphone, how much memory card it is recommended to install in a gadget. However, sometimes this information is not indicated directly, but using the encoding of different types of cards. It’s worth taking a look at the device spec and see which cards are supported. The following may be written there:

  • MicroSD cards are an old standard, which means that a phone’s micro memory card is no larger than 4GB. Sometimes some Chinese manufacturers write that cards up to 8 GB are supported with the same marking, but no more.
  • MicroSDHC cards are the most common format among budget phones and smartphones today. Provides the possibility of expanding memory with cards up to 32 GB, which is quite enough for most users.
  • MicroSDXC cards are a new format that can handle volumes up to 2 TB. Often, cards of this size can be very expensive, but quite popular, inexpensive, and at the same time a functional solution would be to install additional memory of 64 or 128 GB.

The peculiarity of the size of the new memory card

Probably everyone who has previously encountered memory cards or flash drives noticed that the space on them is slightly less than stated by the manufacturer. Why does this problem occur and can it be fixed?

In fact, no problem exists. The reason lies in the principles of calculating space by a computer or telephone. We are accustomed to multiplying all quantities by a thousand, as, for example, in one kilogram, a thousand grams. However, in the computer world, the calculation is a little different, and the number in 1024 is considered to be a unit. As a result, such an error arises on the missing 24 bytes for every thousand. Therefore, the manufacturers should not be blamed for such a “shortage”, and an SD memory card with a “cut” memory is actually quite normal.

How to choose a micro SD memory card for a smartphone or tablet

Any micro SD memory card can be selected according to only three parameters that are significant for it. This is volume, speed and price.

As for the form factor of the device, in modern smartphones and tablets, only micro SD memory cards are used, as the most compact.

Memory card capacity

The first thing to look for when choosing a micro SD memory card is the letters that go after SD in the designation.

SD. Sesure Digital memory cards come in two generations. These are HC. High Capacity and XC. eXtendec Capacity.

HC memory cards can be up to 32GB, and XC cards can be up to 2TB. But it’s worth saying that this is only in theory.

Usually in nature, they are found in the range of up to 128 GB. Of course, the larger the volume, the better, but the price will also increase accordingly.

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Speed ​​characteristics

In addition, all micro SD cards are divided into classes. The class of the memory card is always indicated on the packaging and on the card itself.

Depending on the task at hand, it may be that a high-end micro SD card is not needed at all.

It’s all about the write speed. The number of a certain class means how many MB per second the memory card can write.

Micro SD memory cards are available in the following classes:

  • SD Class 2. write speed equal to or more than 2 MB / s.
  • SD Class 4. speed not less than 4 Mb / s.
  • SD Class 6. 6 Mb / s.
  • SD Class 10. 10 Mb / s.
  • SD Class 12. 12 Mb / s.
  • SD Class 16. 16 Mb / s.

These numbers indicate the minimum speed at which a specific SD memory card will write.

In fact, the write speed will be higher, that is, definitely not less than the stated.

There is also a high-speed UHS memory card interface. On a UHS-enabled card, I or II is added to the logo. Depends on version.

Cards operating on the high-speed UHS bus have two speed classes:

  • Class 1. write speed from 10 Mb / s
  • Class 3. write speed from 30 Mb / s.

Choosing a micro SD memory card

  • If you have a simple mobile phone on which you plan to listen to MP3 music or take photos with a camera with a resolution of up to 5 Mp, then any memory class will do.
  • If there are more megapixels in the camera, then you need a micro SD class of at least 4.
  • If the device writes HD video, then you cannot do without a class 6 memory card, at least.
  • Grade 10 is suitable for professional photo and video equipment, which is able to write video in high resolution, or take several frames per second.

If it happens to miscalculate the class of the memory card, then the frames on the device will be recorded slowly, which will be impossible not to notice.

The two most popular brands that currently make SD cards are SanDisk and Kingston.

They account for the production of about 70% of all SD cards in the world.

over, SanDisk is the pioneer of manufacturing technology and occupies a slightly larger share in the production of cards.

Now we know the difference and how to choose a micro SD memory card. Therefore, when choosing, you should be guided by the following algorithm:

  • Determine the required size of the micro SD memory card.
  • Choose a micro SD class depending on what recording speed is needed for specific tasks.
  • Choose SanDisk whenever possible.
  • And the last thing is the price of the device. It is formed depending on the given characteristics and the manufacturer. We choose based on our needs and availability of free funds.


Secure Digital Flash Memory Compatibility:

  • SD devices only support SD memory cards;
  • SDHC devices support SDHC and SD memory cards;
  • SDXC devices support SDXC, SDHC and SD memory cards.

Thus, newer equipment is compatible with memory cards of previous generations.

Important: SDXC UHS-I memory cards are readable by SDHC devices, unlike SDXC UHS-II cards.


USB card reader. an adapter included with the card for connecting to a regular USB port.

Microform adapter. an adapter that converts a microform card to a full format.

Write lock. a mechanical switch on the card body to prohibit writing to the card.

4K Video Recording. Allows you to record ultra high definition video. To do this, the memory card must have the appropriate capacity and write speed.

Wi-Fi. used to wirelessly transfer photos and videos from the camera to a computer or other device. For this option to work, the camera must support this technology.

USB plug. makes it possible to connect a memory card to a PC without using a card reader.

Important: when choosing a memory card for a camcorder, pay attention to the bit rate (bit / s, Mb / s). This parameter will help determine the optimal indicators of the volume and speed of flash memory.

Speed ​​/ class

A memory card has two important metrics. write speed and read speed. These parameters are measured in megabytes per second (Mbps).

The read / write speed allows you to estimate the time spent on reading / writing files. For example, with a read speed of 30 MB / s, it will take about 5 minutes to read 8 GB data. And to transfer the same amount of information to a memory card at a write speed of 16 MB / s, it will take about twice as long.

There are several ways to label the speed class of memory cards. These methods give an idea of ​​a constant sequential write speed, which is important for cameras and camcorders, especially if they work with video in Full HD quality and above. Using a flash memory that’s not fast enough will simply not allow recording (the camera will give an error message).

SD / microSD cards (Speed ​​Class)

The write speed of SD / microSD memory cards is indicated by the class of the card (Class), the higher the class, the higher the speed. Class 10. provides 10 Mb / s, Class 16. 16 Mb / s. The figure corresponds to the recording speed.

High data exchange rates are needed if the memory card is used in a smartphone or camera for stills and videos:

  • 4 Mb / s. HD video;
  • 6 Mb / s. Full HD video (720p);
  • 10 Mb / s or 16 Mb / s. Full HD video (1080p);
  • 30 Mb / s. 4K video;
  • 45 Mbps. serial photos.

If the memory card is supposed to be used as an additional storage device in mobile devices, then in this case you can choose a card with a speed of 2-6 Mb / s (Class 2-6).

SDHC / microSDHC, SDXC / microSDXC cards (UHS standard)

UHS-I. high-speed data exchange up to 104 Mb / s. The memory card is marked with the Roman numeral “I”. UHS Class 1 (U1) is used for Full HD video recording, while the Class 3 (U3) card enables 4K and 3D video recording. Suitable for working with serial photographs.

UHS-II Class 3 (U3) is a more advanced option. In such memory cards, the bandwidth is increased to 312 MB / s. Marking. Roman numeral “II”. Ideal for 4K and 3D video recording.

The latest UHS-III communication protocol delivers ultra-fast speeds up to 624 Mb / s. But to date, such memory cards are not yet found.

SDHC / microSDHC, SDXC / microSDXC cards (Video Speed ​​Class standard):

  • V6. 6 Mb / s, compliant with SD / microSD Class 6 cards;
  • V10. 10 Mb / s, the write speed is comparable to SD / microSD Class 10 or UHS Class 1 (U1) cards;
  • V30. 30 Mb / s, conforms to UHS Class 3 (U3) cards;
  • V60. 60 Mb / s (for working with video in 8K resolution);
  • V90. 90 Mb / s (even better suited for recording video in 8K quality).

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In addition, the interface speed is regulated for memory cards:

  • Normal Speed ​​- 12.5 Mb / s and higher (SD, SDHC, SDHC);
  • High Speed ​​- 25 Mb / s and higher (SD, SDXC, SDHC);
  • Ultra High Speed ​​I (UHS-I). 50 Mb / s and above (SDXC, SDHC);
  • Ultra High Speed ​​II (UHS-II). 150 Mb / s and above (SDXC, SDHC).
  • VPG20. 20 Mbps (for Full HD video);
  • VPG65. 65 Mbps (for Full HD and 4K video);
  • VPG130. 130Mbps (for 4K video).

For Compact Flash cards, the data exchange rate is given using a multiplier that shows how many times the speed of reading information from a memory card exceeds the speed of reading a CD-disk (150 Kb / s).

  • 100x. 15 Mb / s;
  • 120x. 18 Mb / s;
  • 133x. 20 Mb / s;
  • 150x. 22.5 Mbps;
  • 200x. 30 Mb / s;
  • 266x. 40 Mb / s;
  • 300x. 45 Mb / s;
  • 333x. 50 Mb / s;
  • 400x. 60 Mb / s;
  • 466x. 70 Mb / s;
  • 500x. 75 Mb / s;
  • 533x. 80 Mb / s;
  • 600x. 90 Mb / s;
  • 633x. 95 Mb / s;
  • 700x. 105 Mb / s;
  • 800x. 120 Mb / s;
  • 1000x. 150 Mb / s;
  • 1867x. 280 Mb / s.

Also, for Compact Flash cards, the interface speed is often indicated:

  • UDMA 2. up to 33.3 Mb / s;
  • UDMA 4. up to 66.7 Mb / s;
  • UDMA 5. up to 100 Mb / s;
  • UDMA 6. up to 133 Mb / s;
  • UDMA 7. up to 167 Mb / s.

SD / microSD cards (Application Performance Class)

This standard, unlike the previous ones, describes the operation of memory cards with applications in tablets and smartphones. In this case, the key characteristic is the number of I / O operations per second when randomly writing / reading data:

  • A1. provides 500 IOPS (random write), 1500 IOPS (random read);
  • A2. Provides 2000 IOPS (random write), 4000 IOPS (random read).

Both classes are capable of recording at 10 MB / s. This parameter is identical to Class 10 cards. Therefore, this characteristic does not matter for cards that are installed in cameras.

Important: some devices require a card of at least a certain class, so carefully read the instructions before buying.


Measured in gigabytes (GB), of course, the more the better, but it all depends on the application. It may be worth taking a few smaller cards.

For example, the average size of a photo in a very good resolution is 10 MB, i.e. only about 800 photos will fit on an 8 GB card (1 GB = 1024 MB). If you are going to record videos, especially of high quality, then you should purchase cards with a minimum volume of 8 GB, and preferably 16 GB or 32 GB.

Often the devices with which the cards will be used may have limitations on the maximum volume. Therefore, before directly purchasing a memory card for a phone, camera or MP3 player, you should clarify the existence of such restrictions.

Tip: for the safety of information, it is recommended to purchase two cards, for example, 16 GB than one 32 GB. In the event of a breakdown of one, you will have data on the second card.

How to choose a memory card

There are many types of memory cards, many of them are slot compatible, some are extremely rare and are used in devices from the same manufacturer. Let’s consider the most common.

Compact Flash (CF). memory cards that have an optimal price-to-memory ratio. Recognized by cameras, computers, MP3 players and other equipment.

Secure Digital (SD). have a high speed of writing and reading data, the ability to protect information from copying, mechanical strength and low power consumption. The dimensions of such cards are 32x24x2.1 mm. Memory capacity. up to 4 GB.

Secure Digital HC (SDHC) is an advanced SD memory card format with more memory (up to 32GB). For use with SDHC compatible devices only.

Secure Digital XC (SDXC). An even more advanced SD memory card format with increased memory capacity (up to 3TB) and data transfer speed.

  • MicroSDXC is a more “advanced” version of MicroSD memory cards, it has an even larger memory capacity (up to 512 GB). This card is only designed for devices that support the SDXC standard.

MicroSD, TransFlash. most often used in mobile phones, tablets, DVRs. MicroSD cards are fully compatible with devices running on TransFlash (T-Flash) cards. Card dimensions 11x15x1 mm.

MicroSDHC is an advanced microSD card format with increased storage capacity (up to 32GB). Used only with microSDHC compatible devices.

MultiMediaCard (MMC). advantages robust mechanical design and low power consumption, main disadvantage is slow interface.

  • Embedded MultiMediaCard (eMMC) is a version of the previous type of card. Used in laptops, netbooks, tablets. Advantages: low price, compact size, low power consumption. Minus. slow work.

Memory Stick Pro Duo (MS Pro Duo). are most often used in equipment manufactured by Sony (smartphones, Playstation Portable game consoles, video equipment). The dimensions of such cards are 31x20x1.6 mm, the volume is 32 GB.

  • Memory Stick Pro-HG Duo (MS Pro HG Duo) is an improved version of the previous type. This flash memory is characterized by a higher operating speed. Overall dimensions and volume are identical to MS Pro Duo. Optimal for high definition camcorders.

Memory Stick Micro (M2). Also used in Sony products. Dimensions. 15×12.5×1.2 mm. Volume. up to 16 GB.

XQD is a new type of memory card. Provides high write speed (up to 125 Mb / s). Designed for use in video and cameras. The dimensions of such cards are 39x30x4 mm. Volume. up to 256 GB.

PS Vita. used only in Playstation Vista (Sony) game consoles. This flash memory is incompatible with other standards. Memory capacity. up to 64 GB.

SXS. memory cards for professional camcorders. A distinctive feature is the increased data transfer rate (up to 2.5 Gbps). Compatible with computers and laptops (via PCI Express). Dimensions. 34x5x75 mm. Volume. up to 256 GB.

  • SDHC card and USB card reader
  • microSD card and SD adapter
  • CF card


The least quality cards can be considered ADATA, Apacer, GoodRAM, Pretec, Transcend, Qumo. The main disadvantages are the lower declared read / write speed, as well as unreliability. And this is one of the most important parameters of a memory card. First of all, the safety of data is important, in some cases. also speed. It should be noted that in terms of cost, the products of these brands do not particularly differ from those of higher quality.

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Memory cards from SanDisk, Kingston, Toshiba, Silicon Power, Team Group have an excellent combination of price and quality. It happens that even high-quality brands have defective products, but their warranty obligations allow you to exchange without problems. When choosing a brand, be sure to inquire about the terms of the guarantee.

Think about what you need a tablet for

Tablets are well suited for the following tasks: online communication, mobile games and content consumption (reading books, watching websites, videos, TV series and films). Some devices are also quite convenient for office work.

The best tablet is the one that best suits your needs. From them, and you need to build on, so as not to miscalculate. Think about what exactly you are going to do on your tablet. This will help you choose the right characteristics of your future gadget.

How to choose a tablet: instructions for those who don’t want to be wrong

From the operating system to the battery capacity: Life hacker disassembles the main details that you should pay attention to when choosing a tablet.


Among Android devices, it is easiest to find an inexpensive, but at the same time, productive and high-quality tablet. In addition, a huge number of services, games and programs for a variety of tasks are available to users. And enthusiasts have a lot of opportunities to customize the system for themselves.

However, most gadgets on this platform do not receive timely updates. As a result, the latest features and bug fixes appear on devices with a delay or not at all.

All new iOS devices are in the high end. But these are always premium class devices with up-to-date characteristics and design that sets fashion. Owners of iOS tablets, to put it mildly, are not deprived of programs, games and services. Devices on this system receive regular updates for several years after entering the market.

Windows 10

Windows hasn’t caught on on smartphones, but it’s doing much better on tablets. The tenth version of this system turns the tablet into a full-fledged laptop replacement. Especially if you connect a keyboard and mouse to it.

Windows 10 tablet owners have fewer apps available than other platforms. But they can install full-fledged desktop games and programs, including the Microsoft Office suite. And this is a huge plus for those who need a tablet for work.

If you use a Windows computer, you will quickly figure out with a tablet on the same OS.

Support for wireless technologies

The more wireless technologies a gadget supports, the more opportunities it has for transmitting and receiving data.

If you plan to use the device mainly in the office and at home, then, most likely, the Wi-Fi module, which is present in all tablets, will be enough for you. If you are going to use network functions on the road, then buy a device with support for LTE (4G) networks.

You may be connecting headphones, keyboards, mice, and other wireless devices to your tablet. In this case, select a device that supports the Bluetooth wireless standard version 4.0 or later. This will ensure fast communication with accessories while minimizing battery stress.

Decide on the display size

Based on the length of the screen diagonal, tablets can be roughly divided into three categories: compact (7-8 inches), medium (9-10 inches) and large (11-12 inches).

  • Compact tablets are great for chatting, most gaming, reading books, and surfing the web outside the home. For these tasks, they are more convenient than smartphones when you are not on the go. But still, the diagonal of the display is 7-8 inches long is not always enough to view PDF documents or enjoy TV shows and movies.
  • Medium tablets are the perfect balance between mobility and affordable features. Such devices cannot be put into your. but they are often more powerful than their smaller counterparts and more convenient for viewing multimedia content and playing games. They also really work when the laptop is not at hand.
  • There are not so many large tablets yet. They are the most productive and also best suited for business tasks thanks to their screen size and accessories. But at the same time, it is already difficult to call them portable. In addition, such devices are the most expensive.

Microsoft Surface Pro 4

Best cards

Now you know the characteristics and can choose not expensive, but a good option for your gadget. The devices are different, and the parameters you need are also different, and each is important. Therefore, first decide on the type of device. There are top memory cards with the best memory cards.

Don’t forget to talk to customers for opinions on models and their specifications. It is better to choose a device that has already been tested in operation. It is important to remember about the price-quality ratio.

How to choose microSD cards for Android phones, dashcams and drones – DIY in 5 Ep 96

  • The first is Sandisk, and the Extreme SDHC UHS Class 3 60MB / s model.
  • The second is Kingston and the SDA10 model.
  • And the third. Transcend, model TSSDU1.
  • The first one is Sandisk. and two models: Ultra microSDHC Class 10 UHS-I 48MB / s and Extreme microSDXC Class 10 UHS Class 3 60MB / s.
  • The second is Transcend, and model TSUSDHC10U1.
  • Allocate Silicon, and Model Power 400X Professional Compact Flash Card.

It is important to know

While the card is in the gadget, it is protected. But if you pull it out, then anything can happen to it. For example, she will fall. Or be exposed to sunlight. Maybe it will be very cold, and this also adversely affects the memory card. There is nothing worse than soaking it in water. It is strictly forbidden to expose it to x-rays. Therefore, at airports, you need to put the card into the device.

It is important to know that such cards are also sold that have protection against this impact. So check with the seller.

Memory size

Each memory card has its own capacity. It means that a certain amount of information will fit on it. The larger the volume, the more information, and the higher the price. So how much memory do you need? A lot depends on your device. For example, 2-4 GB will be enough for phones, some support 8, but you need to find out if the device will not “glitch”. But for a video recorder or camera, you will need at least 16.

In addition, the size is directly affected by the resolution of the image. The larger it is, the more volume will be required. The best one is 128, but remember to check that the mechanism supports such a large volume and does not “glitch” when used. This is important because many newbies then encounter this problem and think that the problem is in the gadget, but it turns out that the memory card was selected incorrectly.

The more various small details in the picture, the better it is, and the more space it needs. The same can be said for videos. Let’s give an example. Let’s say you have a video clip in RAW format. Its one frame will take 30 MB. Imagine that you are shooting a wonderful winter landscape or relaxing on the beach, and suddenly you find that there is not enough space on your memory card. Therefore, if you are thinking how to choose a memory card. then buy 32 GB.

Below in the photo you can see a sign that tells how many videos and pictures can be recorded on a specific card.

Which memory card to choose

If you have gadgets, then you probably are faced with the fact that you need to choose a memory card for a tablet, camera, video recorder, smartphone. Most likely, some kind of memory is already built into the device, but if you want to download and use photos and videos, then it will not be enough. If you look at the cards, you will think that they are not that different, but this is a completely misconception. Now we will tell you how to choose an inexpensive, but good memory card, just for your device. Then all your data will be safely stored. And for those who have little time, a video instruction from experts is attached.

But this type is divided into subtypes by capacity: large and extra-large. And if your camera is 10 years old, then you will not be able to use a large capacity. And if even more, then the extra-large will not work.

The camera for professionals is equipped with a type of memory card called CF. This abbreviation stands for “CompactFlash” and means that this card can also be used as a flash drive. It has a large volume and high-speed recording. But not every camera can handle high-speed transmission. Honor should do this before choosing a good memory card.

It is best to have direct access to memory. Compact smartphones and tablets use microSD. The same card can be applied to some cameras and DVRs.

But despite the name, this memory card for gadgets is as functional as the rest. Some manufacturers come up with their own flash drives. Then the device should have a combo slot or two.

Map class

A person bought himself a memory card and often does not even know that it also has speed. Nevertheless, it is very important. If you are recording Full HD video, then the slow speed will lead to the fact that the shooting will be interrupted every now and then. If you shoot a series of frames, the camera will freeze. It is very uncomfortable. Therefore, you need to know which card is slow and which is fast.

The most common cards are SD cards. The speed is always indicated on them.

Which class of memory card is better? The above table shows that the smaller the class, the lower the speed. Let’s say the second class is selected. This means that the speed will be 2 MB. In this case, the speed is indicated real.

How to choose the right class? For example, you are shooting Full HD video. The minimum grade is sixth, but 10 is better. If the memory card is fast, then you can shoot every day and take a series of pictures. As long as photos are being recorded to a slow card, you’ll miss out on cool shots.

Let’s say you shoot people, animals, or machinery that move quickly. Then more speed is needed. from 30 to 45 mb / s. The first is minimal, the intervals between the series of pictures will be small when the pictures taken are recorded on the card. If you are a professional photographer, how to choose a memory card? Of course, high-speed. at least 100 mbps.

Reading speed is not that important. It is the same or higher than the write speed. Therefore, when you buy a memory card with a high write speed, then know that the write speed will be the same.