How to combine SD card with internal memory on Xiaomi

Many Xiaomi smartphone users face a shortage of space when the system insists on freeing up space. Standard 64 or 128 gigabytes may not be enough for games, photos and videos, and internal memory can not be physically expanded. In such situations, Adoptable Storage technology comes to the rescue, allowing you to turn an external memory card into a full-fledged extension of the system partition.

Xiaomi in its MIUI shell and new HyperOS often hides this feature by default, but it can be activated. Android allows you not only to transfer files, but to fully integrate the drive into the structure of the file system. This allows you to install applications directly on the map and forget about the eternal notifications of space shortages.

However, the procedure requires care, as all data on the media will be destroyed during the formatting process. You will need a microSD card with high read and write speeds, preferably U3 or V30. Using slow cards will lead to noticeable delays in the interface and applications.

Features of Adoptable Storage technology on Xiaomi

Adoptable Storage technology was introduced in Android 6.0, but manufacturers often turn it off in their firmware. On Xiaomi and Redmi devices, this feature is hidden software to encourage the purchase of models with a large amount of internal memory.

The main difference between this mode and the usual use of a flash drive is encryption, and once combined, the memory card is encrypted for a particular device, it can no longer be extracted and inserted into another phone or computer without losing data and re-formatting, which is an important security feature that should be considered beforehand.

Performance is directly dependent on the quality of the drive used. If you decide to combine storage, make sure that your card supports UHS-I standards. Slow cards can become a bottleneck, which will make the launch of applications significantly longer than when working with internal eMMC or UFS memory of a smartphone.

⚠️ Note: The process of formatting the card as internal memory is irreversible. SD-The card will be removed without the possibility of recovery by standard methods.

Preparation of a memory card and smartphone

Before starting the procedure, you need to make sure that your hardware is ready for changes. Not every memory card is suitable for internal storage. Cheap models with low write speed can cause unstable operation of the Android operating system.

Back up all important data from card to computer or cloud storage. During the setup process, the drive will be fully formatted in the EXT4 or F2FS file system, making it unreadable for Windows without special drivers.

It is also worth checking the status of the card slot in the smartphone itself. If the contacts are oxidized or the slot is loose, permanent contact will be disrupted, which can lead to errors in the operation of applications transferred to the external drive.

Activate hidden settings through the engineering menu

Xiaomi's standard settings menu often doesn't include "Use as internal memory." To access this feature, you need to activate hidden debugging mode or use special commands. One way is to activate the developer mode.

Go to Settings → About Phone and click on MIUI or HyperOS several times. Then go to Additional → For Developers. Here you will find the option associated with the forced permission to write to an external drive, although newer versions of Android may not have this switch.

A more reliable method is to use ADB (Android Debug Bridge) via a computer, which requires connecting your smartphone via USB, enabling debugging over USB, and typing a command to force the formatting of the card as internal memory, which requires basic command-line skills.

Step-by-step instructions for combining memory

So let's look at the process of setting up through the standard interface, if your version of firmware allows you to do that, or through a menu emulation, put the card in the phone that's off, then turn the device on. The system has to identify a new medium.

Go to Settings → Memory (or Storage). Click on your memory card name. From the menu that opens, select Format. The system will offer two options: Use as a portable storage and Use as an internal storage. Choose the second option.

Then the system will run a speed test and start the formatting process. This can take from 1 to 10 minutes depending on the size of the map. Once completed, Android will offer to move the data (photos, media files) to the new drive. Accept the transfer to free up space in the system partition.

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After combining the memory, restart the smartphone. This is necessary for the system to correctly mount the partitions and update the paths to the application files.

If the standard path doesn't work, use the ADB command: sm partition sdcard:private. This command will force the card to be broken by reserving part for the system. Be careful, the syntax of commands may vary depending on the version of Android.

Application portability and data management

Once you've successfully combined, you can migrate applications. Go to Settings → Applications → All apps. Select the program you want, go to Memory and click Move. Not all apps support portability, as it depends on the developer.

Google system applications and important services should be left unattended, leaving them on fast internal memory, which will ensure stable operation of the interface, you can safely transfer heavy games, social networks and instant messengers, which take up a lot of cache space.

File management is done through standard Explorer. The path to files on the combined card may change, but it will remain transparent to the user. Applications will see a single space if they correctly request permissions.

Possible problems and ways to solve them

Once the memory is combined, users may experience read errors, and if the memory card is left or damaged sectorally, the system will constantly issue error notifications, in which case it will require re-formatting, which will again lead to data loss.

Another problem is speed reduction: Xiaomi’s built-in memory (UFS 2.1/3.1) is much faster than even the fastest microSD cards. Launching heavy apps from a card can take 20-30% longer. This is a fee for increasing volume.

⚠️ Warning: Do not remove the memory card while the phone is on. Since it is part of the system partition, the extraction will lead to a drop in working applications and possible database errors.

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The speed of the smartphone after the memory combination depends on the speed class of your device. SD-Use the standard cards. A2 to minimize delays.

If you notice that your phone is running slower, try clearing the cache of the ported apps, and check the health of the card with utilities like SD Insight or TestDisk on your PC.

Should I combine memory: pros and cons

The decision to merge memory should be considered. On the one hand, you get a single space that doesn't need to be constantly monitored; on the other hand, you lose the speed and flexibility of using the card. For budget models with little internal memory, this is often the only solution.

If you change your smartphone a lot, this is not the method you want to use, and every time you change your phone, you have to reconfigure the system and transfer the data, because the old card will be encrypted with the previous device, and it's effective for stationary use of one device.

• 🚀 Plus: The ability to install heavy applications that don’t fit into standard memory.
• 💾 Plus: Single space for photos and videos without manual file transfer.
• 🐢 Cons: Reduce the overall speed of the interface and start programs.
• 🔒 Disadvantage: Inability to quickly read the map on other devices without formatting.

To sum up, we can say that the technology is useful for extending the life of budget smartphones, but on flagships it is better to use the card only for media files, leaving the system on a fast internal drive.