Combining Flash Card with Xiaomi Phone Memory: The Complete Guide

Xiaomi smartphone owners often face a shortage of internal memory, especially if the device from a budget or medium range (Redmi Note 12, POCO X5, Mi 11 Lite).The solution is the use of Adoptable Storage technology, which allows you to combine a microSD card with an internal drive into a single storage. However, in MIUI, this process has nuances: since the version of MIUI 12, Xiaomi has removed the standard option of formatting the card as internal memory, leaving only the portable drive mode.

In this article, we will discuss all working ways to combine memory on current firmware versions (including MIUI 14/15 based on Android 13/14), consider flash card requirements, possible errors and alternative solutions. Importantly, the process is irreversible - once formatted, the card will not be used on other devices without full cleaning. Also note that on some models (for example, Xiaomi 13 Ultra or Redmi K60 Pro), the memory consolidation function is blocked at the kernel level.

1.Preparation: Which flash cards are suitable for combining

Not every microSD card is compatible with Adoptable Storage technology, and Xiaomi has strict requirements for the drives:

🔹 Speed class: minimum UHS-I (U1) class 10. For smooth operation of applications is recommended UHS-I (U3) or A1/A2 (application-optimized).
🔹 Capacity: from 16 GB (but in practice better 32 GB)+, because the system is in reserve ~10% of space).
🔹 Manufacturer: give preference to brands SanDisk, Samsung EVO, Kingston Canvas – Cheap no-name cards often cause errors.
🔹 File system: the card must be formatted into FAT32 or exFAT (the system will transfer it to the system itself) ext4 unionize).

Before buying, check the card for authenticity with H2testw (Windows) or FakeFlashTest (Android). Counterfeiting often has understated real capacity and recording speed, which will cause failures after the combination. Also note: cards with an adapter for Nintendo Switch or cameras may not work — their controllers are optimized for other tasks.

⚠️ Note: If you use the card SDXC (With a capacity of over 32 GB, make sure your smartphone supports this standard. 5A, Mi A1) They can only work with SDHC (32GB).

Method 1: Standard formatting through settings (MIUI 10–12)

On older firmware versions (MIUI 10-12), the memory merge function was available directly, and if your smartphone hasn’t yet upgraded to MIUI 13+, follow the instructions:

Insert a microSD card into the slot (on some models, for example, Redmi Note 9 Pro, only a hybrid slot is supported - you will have to choose between a second SIM or a flash drive).

After the reboot, the system will suggest moving data (photos, videos, some apps) to the combined storage, and note that not all applications can be moved - some (such as WhatsApp or Google Play Services) remain in internal memory.

Backup your card | Charge your phone at least 50% | Make sure the card isn't fake | Disable the second SIM if the slot is hybrid-->

Method 2: Circumvention of Restrictions through ADB (MIUI 13–15)

In the new versions MIUI (MIUI 13 and above) the formatting option as internal memory is hidden, but it can be activated via ADB-This method works on most models, including Xiaomi. 12T, Redmi Note 11 Pro+, POCO F4.

Step 1: Preparation

📱 Enable Developer Mode: Go to Settings → About the phone and 7 times tap on the version MIUI.
🔧 Back to Settings → Additionally. → For developers and activate debugging by USB.
💻 Install. ADB-Drivers on PC (download Platform Tools from Google).

Step 2: Execution of commands:

Connect your phone to your PC via USB (select File Transfer Mode).
Open the command line (Windows) or terminal (macOS/Linux) in the adb folder.
Enter in turn: adb devices (you should have your device name) adb shell sm list-disks (remember the card ID, for example, disk:179.64) sm partition disk:179.64 private (replace 179.64 with your ID)

Once the last command is executed, the phone will automatically restart and the card will become part of the internal memory.

🔌 Correctness of connection by USB (Try another cable/port).
📋 Correctness of the entered disk identifier.
🛠️ No broken sectors on the map (scan it on PC).

Standard formatting through settings|ADB-team|Third-party applications|I haven't tried it yet.-->

Method 3: Applications for compulsory association

If ADB seems complicated, you can use third-party utilities.

Annex	Compatibility	Features	Reference
Storage Settings	MIUI 12–14	Restores the hidden formatting option	Google Play
SD Maid	Android 8–13	Clears the cache before combining, reduces the risk of errors	Google Play
App2SD	MIUI 10–13	Transfer applications to the map after the merger	Google Play

When using Storage Settings, the algorithm is simple:

Install the application and grant root rights (if required).
Choose yours. SD-card.
Slip Format as Internal and confirm the action.

⚠️ Attention: Apps like Link2SD or FolderMount creates "symbolic links" instead of a full-fledged association, which can lead to data loss when updating. MIUI or reset.

Possible problems and solutions

When combining memory, users often encounter the following errors:

🚫 "Map damaged" → Check the card on another device or format it in FAT32 PC.
🚫 "Not enough space" → Free up at least 10% of internal memory before combining.
🚫 "Function not supported" → On some models (Xiaomi 13, Mix Fold 2) the unification is blocked. MIUI.
🚫 "Applications are not installed on the map" → Enable the option to Set by default on SD developer-setting.

If the phone started to slow down after the combination, the likely reason is the slow card write speed.

🔄 Move frequently used applications back to internal memory.
🗑️ Clear the cache in Settings → Memory. → Cleanup.
🔧 Turn off Windows animation in the developer settings (reduce the storage load).

What if the phone doesn’t see the card after the merger?

If, after formatting as internal memory, the card is no longer defined: 1. Reboot the phone in Safe Mode (press the power button → “Reboot in Safe Mode”). 2. Connect the phone to the PC and check if the card is displayed in Device Manager. 3. If the card is visible as an Unidentified device, format it through DiskPart (Windows): diskpart disk list select disk X (where X is your card number) create clean partition primary format fs=fat32 quick 4.

6. Alternatives to unification: how to save space without risks

If memory consolidation seems risky or doesn’t work on your model, consider alternative ways to free up space:

📁 Media File Transfer: Use the built-in Settings option → Memory. → Move it to SD-photo, video and music map.
☁️ Cloud Storage: Mi Cloud (5GB free), Google Photos (compression without restrictions) or Yandex Drive (10GB).
🗃️ Cache Clearing: Apps like CCleaner or Files by Google find unnecessary files (app residues, duplicates).
🔄 Lite versions of applications: Replace "heavy" applications with lightweight ones (Facebook Lite, Messenger Lite, Spotify Lite, etc).

To automatically optimize memory, switch on MIUI:

Settings → Memory → Autoclean (will remove unnecessary files at low memory level).
Settings → Applications → Cleaning according to schedule (closes the background processes).

💡

If you shoot 4K video frequently, reconfigure your camera to 1080p – this will reduce file size by 3-4 times without significant quality loss.

7. How to cancel the merger and return the card to its original state

If you decide to disconnect the storage, you can only do this through a full reset or ADB. Conventional formatting via PC will not help – the card will remain in ext4 format, unreadable for other devices.

Method 1. Through settings (without data loss):

Go to Settings. → Memory.
Tap it on. SD-map → Three dots (menu) → Formatting as a portable.
Confirm action. Attention: all data from the map will be deleted!

Method 2. via ADB (if there is no option in the settings):

Connect your phone to your PC and activate Debugging via USB.
Enter the command: adb shell sm forget disk:179.64 (replace 179.64 with your card ID from the sm list-disks command).
Reboot the phone.

⚠️ Warning: Once disconnected, all the apps on the map will stop working. You'll have to reinstall them manually. Android/data on the map – some games (e.g. Genshin Impact) save progress that can be lost.

FAQ: Frequent questions about memory integration

Can I combine memory on Xiaomi without root rights?

Yes, on most models, this is possible through ADB or standard settings (on MIUI 10-12). Root rights are only required for some third-party applications (e.g. Link2SD), but they are not recommended due to the risk of a security breach.

Why does the card work slower after the merger?

This is because microSD cards (even A2 class) are slower than UFS 2.2/3.1 internal memory. The system constantly moves temporary files between storages, which creates delays. Solution: transfer only media files to the map, and leave the applications in internal memory.

Will the combined memory work after the MIUI update?

Yes, but with reservations: with a normal update (via Settings → System Update), the data will be saved, but with manual flashing (via Fastboot or Recovery) or resetting, the card can be formatted automatically.

Can I use a combined card on another phone?

No. Once formatted as internal memory, the card is encrypted for a particular device, if you insert it into another smartphone, the data will not be available, and to use the card again, you need to format it as a portable one (see section 7).

Which Xiaomi models do not support memory integration?

Starting with Xiaomi 12 series and flagships 2022–2026 years 13/14, Mix Fold 2/3, Redmi K60 Ultra) is locked at the kernel level, and unification is not available on dynamic memory devices (RAM Expansion), as they use part of the drive under the virtual RAM.

💡

Memory integration is an effective but risky way to expand storage. If your smartphone supports this feature, use A2 cards and back up your data regularly.