What is a memory card in a phone? Which class of memory card is best for a smartphone? What is a memory card class

It would seem that there is nothing difficult about buying a memory card. We decided on the required volume, found a good deal and bought it. It is because of this approach of users that some manufacturers offer flagship smartphones with expandable memory. If you have a microSD card at hand, take a look at how much stuff is written on it. This information will help you make the right choice.

Why bother with all this?

This is the question to start with. Imagine that you bought a new modern flagship smartphone with memory card support, for example, LG G4. Such a smartphone should easily cope with all tasks, but suddenly you notice that the camera and other applications of your smartphone are not working as fast as you expected. This is possible if you are using a memory card that is not fast enough, on which photos are saved and from which your applications take data. However, nothing prevents you from paying a little attention to the issue and choosing the memory card with which your smartphone can please you constantly.

What is the difference between SDHC and microSDXC?

When buying a memory card, you should pay attention to these big four letters, but the difference between these two standards is only in the supported amount of data. SDHC (Secure Digital High Capacity) allows you to store up to 32 gigabytes of data, while SDXC (Secure Digital Extended Capacity) can handle 64 gigabytes and above. The problem is that not all devices support SDXC cards and such a large amount of memory. Check the capabilities of your smartphone before purchasing a 64 or 128 GB memory card.

What does the memory card class mean?

microSD cards can be grade 2, 4, 6, and 10, and this is what you really need to pay attention to. These numbers indicate the supported data transfer speed, and while a microSD memory card can write data at a minimum speed of 2 MB/s, a Class 10 memory card works at a minimum speed of 10 MB/s. Not that difficult. It is important to understand that we are talking about the minimum write speed, and with good memory cards the data read speed can reach up to 95 MB/s.

What does UHS mean?

Another information about the memory card that you may notice is UHS-1 or UHS-3 compatibility. Such microSD memory cards began to appear in 2009. In theory, a UHS card can support data transfer speeds of up to 321 MB/s, but you should focus on the minimum speed: 10 MB/s for UHS-1 and 30 MB/s for UHS-3. In fact, if you plan to use the card in a smartphone, you should not focus on this, smartphones do not support UHS.

What else is important to know?

It would be a good idea to purchase a memory card from one of the trusted manufacturers, for example, SanDisk, or Kingston. It is also worth paying attention to the cost. If you suddenly find a suspiciously cheap memory card, you should be wary of it.

Based on materials from AndroidPit

With this article, our website continues a whole series of useful materials, the purpose of which is to make it easier to choose any product from the thousands of options offered on the market. Agree, choosing a specific model of a device always takes a lot of time, which can be spent usefully. In today's material we will talk about choosing a memory card for a smartphone, tablet or camera.

Introduction

Flash memory is used today in almost all electronic devices - both in personal computers and laptops in the form of SSD drives, and in mobile devices - in the form of internal memory and flash cards. The latter will be discussed in this article. Using a small card (their size has long allowed them to be used in the most compact and thin devices), you can increase the available memory of a smartphone, camera or tablet by many gigabytes, so you can carry more content with you - games, music, videos or books and magazines . In addition, the cost of high-capacity and fast memory cards today is lower than ever.

Memory cards are not as fast as USB flash drives, but their speeds have long reached a level that allows you to easily record 4K video on them, much less view it. But different card models can vary greatly in their data writing and reading speeds - you will learn about this in the section dedicated to their characteristics. But it is worth noting that different devices can support cards of a certain maximum capacity - for example, cheap smartphones sometimes cannot work with microSD cards with a capacity of more than 32 GB. Also, don't expect new speed gains from an old camera by using a card with a higher speed class - it's likely that the card will run in a slower mode to ensure compatibility. To find out about support for specific speeds and memory card sizes, you need to refer to the official user manual of a particular device.

By 2015, the memory card industry had focused on just two types - SD and microSD. The former are more often used in photo and video cameras, sometimes in laptops; the latter are more often used with smartphones and tablets. Once upon a time there were many more types of cards - some of you may probably remember names like MMC, Memory Stick Duo or xD-Picture. Fortunately, this fragmentation is now gone - almost any device supports either SD or microSD cards (or even both formats). We will talk about their differences, as well as other important characteristics below.

Main characteristics of memory cards

As we already reported in the introduction, now almost the entire memory card market is occupied by models of two types - microSD. They are used in all possible electronic devices: cameras, smartphones, tablets, e-readers, GPS navigators and even some game consoles.

SD and microSD cards are divided into four generations. SD 1.0 generation cards supported volumes from 8 MB to 2 GB, SD 1.1 generation cards - up to 4 GB, SDHC - up to 32 GB, SDXC (the most advanced and expensive) - up to 2 TB. SDHC and SDXC cards cannot be used with SD 1.0 / SD 1.1 devices.

The main thing to remember is that a device that can handle a newer SD card standard will be able to handle older cards, but most likely not the other way around (more on this below).

Memory capacity, GB

Memory cards with a capacity of less than 16 GB are hardly worth buying - their cost has already dropped to a very low level, and 16 GB is not so much for high-quality photos and videos. If you plan to get serious about photography or video shooting, you'll probably want to use a card with at least 32GB of memory, or better yet, 128GB. If you just want to increase the memory of your smartphone, then 32 GB will be quite enough in most cases.

Data writing and reading speed

The write speed of a memory card may be a very important parameter for you. The fact is that when taking photos and videos, cameras transfer the received data to the internal memory buffer, and from there the photos and videos are transferred to the card’s memory. If this buffer fills faster than the data can be written to the card (for example, when shooting in burst mode, when the camera takes a series of high-quality images), then it will simply be lost.

Read speed is not that important, but the higher it is, the faster you can work with the data that is recorded on the card. For example, if you want to watch high bitrate video on your tablet in FullHD or higher resolution, then you will need a pretty good card.

You can see examples of maximum and satisfactory card speeds below - in the " 10 best SD and microSD cards".

UHS interface support

UHS is a faster interface that is supported by more expensive SD and microSD memory cards. UHS-I allows you to transfer information at a speed of 50 MB/s or 104 MB/s, and UHS-II - at a speed of 156 MB/s or 312 MB/s.

Speed ​​class

A designation of the form "Class x" or "Ux", which indicates the minimum standardized data transfer rate of a particular card. Memory cards can have the following speed classes:

• Class 2 - at least 2 MB/s, you can record SD video.
• Class 4 - at least 4 MB/s, you can record HD video or FullHD video.
• Class 6 - at least 6 MB/s, you can record HD video or FullHD video.
• Class 10 - at least 10 MB/s, high-quality FullHD video recording.
• UHS Speed ​​Class 1 (U1) - at least 10 MB/s, high-quality FullHD video recording.
• UHS Speed ​​Class 3 (U3) - at least 30 MB/s, video recording in resolution up to 4K.

In addition, manufacturers often designate the speed of their memory cards with a multiplier such as "100x" or "600x" in the name. Several of these multipliers correspond to speed classes (13x - Class 2, 26x - Class 4, 40x - Class 6, 66x - Class 10), and the fastest cards currently have a 633x multiplier and can transfer data at speeds of up to 95 MB/s .

Adapters included

Special adapters may be supplied with the memory card for use in devices that do not support its original type. In most cases, this is an SD adapter for microSD cards - a plastic housing for a microSD card that allows you to insert it into a slot for SD cards, which are much larger. If you plan to use one card on several devices that support different types, then the included adapter will definitely not hurt.

USB card reader included

You can transfer captured photo and video files to a PC not only by connecting the camera itself - it is much more convenient and sometimes faster to use a special card reader that is inserted into the USB port of the computer. The presence of such a card reader in the kit is a very nice bonus, which usually does not cost too much.

10 best SD and microSD cards

An SD card that will do an excellent job of recording high-quality FullHD video and taking large photos in burst mode. Those who record 4K video will want to use models that are recommended by their camera manufacturer.

A cheaper SD model, which should also do an excellent job of recording FullHD video and taking high-quality photos.

A very high-speed and quite expensive SD model that can easily cope with recording 4K video and has a large enough capacity for its temporary storage.

A slightly faster SD card than the first two models on this list. It also does an excellent job of recording FullHD video and has twice the capacity.

The best memory cards for phones, tablets, cameras, quadcopters and others.

It wasn't that long ago that we had a choice when it came to external memory for your phones, cameras, and portable gaming systems. You could buy the Sony Memory Stick Duo, which seemed like an overkill no matter what your needs, but on the other hand, you could treat yourself to one of the best SD and MicroSD cards for much less.

Considering that most people don't care about the speed and capacity boost Memory Stick Duo offers over SD cards, memory cards have won like Blu-Ray beat HD DVD, resulting in us being saved from the complex memory card variety , left with MicroSD and SD cards.

With the best SD cards on the market currently coming from a variety of tech companies being used in everything from DSLR cameras to Nintendo Switch consoles, we felt it necessary to curate our own ranking, leading you to what will inevitably be your tiniest property. Below you will find a ranking of the best MicroSD memory cards, followed by a buyer's guide in which we will explain all the features of MicroSD and understand their speeds and characteristics.

The best memory cardsMicroSD andSD in 2018:

Samsung Evo Plus

The best and most versatile card MicroSD.

Capacity Interface: MicroSD.

• pros: Fast | Reliable;
• Minuses: Darling | Not the fastest;

The best SD card you can buy is technically a MicroSD memory card, although it can be used at full size with the appropriate adapter. While it's not the most resilient MicroSD card on the market, the Samsung Evo Plus's 100 megabytes per second (MB/s) write speed and 90 MB/s write speed are impressive. Not only this, but the wide range of sizes available to choose from, be it 32GB or 128GB, makes the Evo a good choice.

Samsung Pro+ (Plus)

Best card MicroSD for video.

Capacity: 32 GB, 64 GB, 128 GB | Interface: MicroSD.

• pros: Reliability | High speeds;
• Minuses: Expensive;

If you shoot a lot, especially in 4K, then you'll need a reliable MicroSD card that can quickly record large amounts of data, which is what the Samsung Pro+ does. This is a U3 rated MicroSD memory card with read/write speeds of 95 MB/s and 90 MB/s. The fast speeds available from the Samsung Pro+ memory card would be largely overkill for everyday tasks in a smartphone, but for 4K video recording it's a fantastic memory card.

SanDisk Extreme Plus

Flagship map memory MicroSD.

Capacity: 32 GB, 64 GB, 128 GB | Interface MicroSD.

• pros: Very high speeds | Recording small files;
• Minuses: Expensive;

SanDisk claims that this MicroSD card can read up to 95 MB/s and write up to 90 MB/s, and the card comes quite close to those speeds in tests. This makes the memory card extremely fast, and with smaller files the speed increases even faster, meaning it's a great card for action cameras, quadcopters or pocket cameras. Again, this is a bit of a pricey card, but if you don't mind spending a little more, you'll get a great MicroSD card for your needs.

Lexar 1000x

A memory card with excellent value for money.

Capacity: 32 GB, 64 GB, 128 GB | Interface: MicroSD.

• pros: Good price | Included USB 3.0 adapter;
• Minuses: Not the fastest card | Inconsistency;

The Lexar 1000x isn't the fastest microSD card on the market, but that doesn't stop it from being one of the best because of its other benefits. For example, the reading speed of a memory card remains the fastest, and moreover, the memory card is cheaper than most of its competitors. While it can't offer the same write speeds, the difference won't be noticeable to most people. The memory card also comes with a MicroSD to USB 3.0 adapter, making it easy to transfer your files to your PC.

SamsungEvoSelect

Another great universal card MicroSD.

Capacity: 32 GB, 64 GB, 128 GB, 256 GB | Interface: MicroSD.

• pros: High speeds | Decent price;
• Minuses: Amazon Exclusive;

As you can probably guess from the number of entries in our ranking of the best MicroSD memory cards, Samsung makes excellent memory cards that are fast, efficient, and reliable MicroSD cards. The Samsung Evo Select is another great all-rounder that's at home in a digital camera, drone, phone, or Nintendo Switch. While the memory card doesn't necessarily excel at any particular task, the card is powerful enough and performs well. Currently, Samsaung Evo Select MicroSD cards are only available from Amazon. While this makes purchasing a discount card a little more difficult, at least you can buy with confidence from a reputable seller.

Kingston Industrial Class 10 U1

Reliable card MicroSD.

Capacity: 8 GB, 16 GB, 32 GB | Interface: MicroSD.

• pros: Strong | Withstands high and low temperatures.
• Minuses: Not amazing performance.

If you're looking for a good MicroSD card that can survive harsh environments like in an action camera, on a quadcopter, or mounted outside in a security camera, then the Kingston Industrial Class 10 U1 is a great choice. First, the memory card can withstand temperatures from -40 to 85 degrees Celsius, the card is shockproof and can withstand x-rays. It's been tested for industrial use and comes with a five-year warranty, so you can use this MicroSD card with confidence.

Kingston microSD Action Camera

The ideal memory card for professionals.

Capacity: 16 GB, 32 GB, 64 GB | Interface: MicroSD.

• pros: Very durable | Good speed;
• Minuses: Not surprising if not in an action camera;

If you're looking for a MicroSD card to fit into an action camera like a Go Pro, you'll need something that can record data quickly and also withstand drops, shocks, and water. The excellent Kingston microSD Action Camera memory card comes to your aid - designed specifically for action cameras. This means you get an incredibly durable design as well as fast read and write speeds. This is a bit of an overkill camera for smartphone use, so we recommend using one of the other MicroSD cards in our rating for this purpose, it will better suit your needs.

How to choose a memory cardMicroSD: Tips

You shouldn't look for SD and MicroSD memory cards with a capacity of less than 4 GB simply because the price you'll pay for two and four times that capacity remains virtually the same.

Make sure you factor in shipping costs when ordering a MicroSD card online; you may pay more for postage than for the memory card, especially for low-cost models.

If you're looking for a high-capacity memory card (32GB or larger), make sure your device is SDXC compatible.

If you plan to move files to and from portable devices (tablets or smartphones), consider a microUSB memory card reader such as Leef Access.

Avoid buying memory cards from suppliers with few reviews, as these cards can easily be counterfeit. All stores listed in our rating undergo multi-level verification and are reliable.

SD cards with capacities of 128GB and above tend to be cheaper, as users typically opt for 64GB as this number is often the maximum supported capacity of most mobile devices. Typically, MicroSD cards with an adapter are less expensive than equivalent SD cards.

Please note that all numbers will likely be significantly smaller than formatted.

SD memory cards are usually divided into classes that give a rough idea of ​​the minimum performance. A Class 4 card is guaranteed to offer at least 4 Mbps, while a Class 10 should exceed 10 Mbps.

Likewise, many manufacturers report available speeds in the form of an "x", which is a multiple of 150 Kbps (the read speed of a standard CDROM). The 100x memory card is expected to deliver over 14 Mbps.

If you're planning on buying MicroSD cards just for data storage, don't do it. Flash drives, being cheaper and more reliable, are a better choice.

Best cardsMicroSD Buyer's Guide

First of all, it is important to understand the MicroSD standards, as well as all the markings. There are different types of MicroSD cards, even if they look the same.

Capacity

Let's look at MicroSDHC first. HC stands for High Capacity and covers sizes from 4GB to 32GB. Over 32GB of MicroSDXC memory cards, where XC stands for eXtended Capacity, and the largest cards in this category available for purchase are 200GB. However, the latest phones and tablets, including the HTC 10, claim support for MicroSD cards up to 2TB. Check your device's support before purchasing a card: many devices do not support SDXC and are therefore limited to cards up to 32GB of memory.

Speed

There are three different speed standards, and you may see more than one on the card. The original speed marking is marked inside the letter C (center of the image above). The number indicates the minimum stable write speed, so a “Class 6” card is capable of recording information at a speed of 6 MB/s - that is, 6 megabytes per second. This is a sequential write speed that is only used when writing large amounts of data (such as video recording) to sequential memory locations. This does not apply to 4KB random writes, a typical solution for phones and tablets where small amounts of data are written to random locations.

Most devices capable of recording HD video require Class 10 MicroSD cards, but most Class 10 MicroSD cards are capable of more than the minimum recording speed of 10 MB/s.

This is where UHS comes into play. This stands for Ultra High Speed, and the class is denoted by the letter U. A Class 1 UHS MicroSD card writes at a minimum of 10 MB/s, while a UHS 3 card writes at a minimum of 30 MB/s. With.

You can also see UHS-I or UHS-II on the map. This indicates what technology the Micro SD memory card uses. The UHS-I "Bus" can operate at speeds of up to 104 Mb/s, while the UHS-II bus can transfer data at up to 312 Mb/s. This doesn't mean the card will read and write at these speeds, these are peak performance.

In order to benefit from the faster speeds available from UHS-I or MicroSD UHS-II, you need a device that is compatible with this standard.

You can easily identify a UHS-II card because it has a second row of pins below the main set. All cards tested in this article are Class 10 or UHS-I.

SanDisk showed off at MWC 2016 in Shanghai what the manufacturer calls the world's fastest microSD card for 256 GB - SanDisk Extreme microSDXC UHS-I 256GB.

The new card uses a new speed classification system called Video Class. You'll see this system on cards soon, marked V. Like the original class system, this means the minimum sequential write speed in MB/s and ranges from V6 to V90.

Best cardsMicroSD 2018: Temperature, X-ray and durability

MicroSD memory cards are small and easy to lose, but in addition to purchasing a special case for your card collection, it's important to choose memory cards that can withstand travel and anything else that might compromise their function.

Some manufacturers claim that their cards are waterproof and also X-ray protected. However, these specifications apply to almost all MicroSD cards. The data isn't stored magnetically, so an airport scanner shouldn't pose a problem, as long as you're not trying to read or write data to a non-waterproof card reader underwater, the MicroSD card should be able to survive surface moisture.

The cards can also carry ratings for suitability at certain temperatures, say -25 to +85 degrees Celsius, withstand shock and shock, and more. As long as you're willing to pay more for one of these cards, you may be entitled to a warranty if it suddenly fails because it's been exposed to heat or "shocked."

The warranty, therefore, is the most important among all these things: check not only the duration but also the conditions that the warranty covers.

The best memory cardsMicroSD: Which card should I buy?

Our main recommendation is to stick with reputable manufacturers who can provide a warranty on their cards. Reputable manufacturers include: Toshiba, Samsung, SanDisk, Lexar, Kingston, and Verbatim, among others.

There are many counterfeits and low-quality MicroSDs out there, so make sure you buy from a reputable supplier. If you see a card on Avito that is significantly cheaper than you expected, don’t rush!

Before purchasing a MicroSD card, check the maximum capacity of the device. Some mobile devices are limited to 32GB of memory because they are SDHC and not SDXC. It's tempting to get a 128GB card, but it simply won't work if the device can't access it.

Quadcopters / Action Cameras

If you're buying a MicroSD card with the intention of recording 4K video, look for a UHS-I Class 3 card. Many also recommend the same cards for recording Full HD (1080p) video, especially at high frame rates.

Phones/Tablets

It's difficult to guide a buyer here using general specifications because these devices rely on small file transfer speeds, which is an important difference. We'll take a closer look at mobile card compatibility in the reviews below.

If your device does not have enough internal memory, can use SD card as internal storage for your Android phone. This feature, called Adoptable Storage, allows the Android OS to format external storage media as permanent internal storage. The information on the installed SD card is encrypted and cannot be subsequently used on another device.

SD Card is a very convenient option for storing photos, songs and videos. Even if you have a large amount of internal memory on your Android smartphone, you may always need a large chunk of memory to store long videos captured by your phone's high-definition camera.

It is important to know

There is one drawback, the SD chip can lag when recording high-definition video.

Android by default in the internal memory and only occasionally uploads data to the SD card. This way, you are prevented from installing any additional applications if your phone is running low on internal storage space, for example, in the case of budget Android One devices.

What is storage storage?

Storage storage is the main memory of your smartphone, but if necessary, it can be expanded using an SD card. This on Android it is called Adoptable Storage. This will allow you to use the removable microSD card installed on your Android phone as your primary storage. This way, you can easily solve the problem of how to make an SD card the main memory on Android and overcome the lack of space if the phone has a small internal volume.

Features of using the card as the main storage

There are a number of important features that should be taken into account during this procedure.

Will be useful

When using a storage device, be it an SD flash drive or a USB drive, it is important to remember what format the device is in and whether the Android operating system supports it, and there are four main file format types: FAT32 or exFAT, ext4 or f2fs.

How to change phone memory to android memory card? The question is not entirely correct, it is impossible to completely replace it, you can only “increase” additional volume.

Using your SD card as your main storage can be a great solution for music lovers and those who like to watch TV shows on the way to work or on a long trip. But, as often happens, memory expansion always depends on the cost of the required device, after all, they differ both in speed and in volume, as well as in the adaptable information storage function. Here are some nuances that can be viewed from different angles - both negative and positive:

How to use SD card as internal memory on Android?

How to replace the phone's internal memory with an external SD card on Android? Configuring your SD card to act as internal storage on Android is essentially a fairly simple process. There is nothing complicated about this and you will see for yourself later.

It is possible that the Adoptable Storage function is not supported by your device, even if the smartphone runs Android 6.0 and higher (this can happen, it all depends on the model and brand of the smartphone). The device manufacturer may have disabled this feature. However, there are command line methods that allow you to force the use of a flash drive to store data.

Below are the basic formatting steps.

On the next screen you have one last chance to decide for yourself if you want to change your mind

It is important to know

Don't forget to back up your data; after formatting, the information will disappear without a trace!

Once the formatting process is complete, you can use the removable SD card as a “temporary” or “removable” permanent location. But keep in mind that hot swapping and ejecting will no longer be available as you may have previously done. That's why Do not remove the flash drive without using the Eject parameter. In addition, you can practically delete the place accepted by the operating system, which, accordingly, is not recommended, since this can cause certain errors in the operation of the device. Now you know how to make a memory card the main memory on Android.

If your phone or tablet running Android 6.0 or 7 Nougat has a memory card slot, then you can use a MicroSD memory card as the internal memory of your device, this feature first appeared in Android 6.0 Marshm.

Using an SD memory card as internal memory

Before you start setting up, transfer all important data from your memory card somewhere: it will be completely formatted during the process.

Further actions will look like this (instead of the first two points, you can click on “ Tune" in the notification that a new SD card has been detected if you have just installed it and such a notification is displayed):

1. Go to Settings - Storage and USB drives and click on the item “ SD card"(On some devices, the storage settings item may be located in the " Additionally", for example, on ZTE).

2. In the menu (button at the top right) select " Tune" If the menu contains the item “ Inner memory", immediately click on it and skip step 3.

3. Click " Inner memory».

4. Read the warning that all data on the card will be erased before it can be used as internal storage, tap " Clear and Format».

5. Wait until the formatting process is completed.

6. If at the end of the process you see the message “ SD card is slow", this indicates that you are using a Class 4, 6 or similar memory card - i.e. 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). We recommend using UHS Speed ​​Class 3 (U3) memory cards.

7. After formatting, you will be prompted to transfer data to a new device, select " Transfer now"(until the transfer, the process is not considered completed).

8. Click " Ready».

9. It is recommended that immediately after formatting the card as internal memory, restart your phone or tablet - press and hold the power button, then select " Reboot", and if there is none - " Power off" or " Switch off", and after turning it off, turn the device on again.

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

However, the function of using an SD card as internal memory in Android 6 and 7 has some features that may make using this feature impractical.

Features of the memory card working as internal Android memory

It can be assumed that when a memory card size M is added to Android's internal memory of N, the total available internal memory should become N+M. Moreover, approximately this is also displayed in the information about the device’s storage, but in fact everything works somewhat 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 providing a choice.
• When connecting an Android device to a computer, in this case you will “ see" and only have access to the internal memory on the card. It's the same in file managers on the device itself.

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 MicroSD memory, then the amount of available internal memory after of the described actions will not increase, but decrease.

Formatting a memory card for use as internal storage in ADB

For Android devices where the function is not available, for example, on the Samsung Galaxy S7, 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 may not work on every device), I will skip the details on installing, enabling USB debugging and running in the adb folder (If you don’t know how to do this, then perhaps It’s better not to take it. And if you take it, it’s 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 of the form disk:NNN,NN - it will be required in the next command)
• sm partition disk:NNN,NN private

Once formatting is complete, exit the adb shell, and on your phone, in the storage options, open the item “ SD card", click on the menu button at the top right and click " Transfer data"(this is required, otherwise the phone's internal memory will continue to be used). Once the transfer is complete, the process can be considered complete.

How to restore normal functioning of a memory card

If you decide to disconnect the memory card from the internal memory, this is easy to do - transfer all important data from it, then go to the SD card settings, just like in the first method.

Select " Portable media» and follow the instructions to format the memory card.