Owners of Xiaomi and Redmi smartphones often face a lack of built-in storage, especially in budget models with 32 or 64 gigabytes. MIUI system and modern applications occupy a significant part of the space, leaving the user with minimal space for photos and videos. Expanding the functionality of the device becomes a critical step for comfortable use of the gadget.
Fortunately, Adoptable Storage technology allows you to turn a regular microSD card into a full extension of the system partition, which means that the phone will perceive the external drive as an integral part of the device, allowing you to install applications and their data on it, but the process requires care, since all data on the map will be irretrievably deleted.
In this article, we will discuss in detail the software and hardware ways to expand memory, how to prepare the drive, what are the limitations of the MIUI shell and how to circumvent standard system bans to get the maximum amount of free space. Proper preparation ensures that your smartphone will work smoothly in the future.
⚠️ Warning: The process of formatting a memory card for internal storage will completely destroy all files on it. Be sure to back up important documents, photos and videos on your computer or in the cloud before starting any operations.
Technical requirements and choice of memory card
The success of the operation depends on the quality of the drive used. Cheap cards of unknown brands often have low write and read speeds, which will lead to serious interface brakes and application freezes. Android requires high performance from internal storage, and a conventional card may not cope with the load.
For comfortable work, it is recommended to use UHS-I or UHS-II cards with a speed class of at least 10. The optimal choice will be models from proven manufacturers such as SanDisk, Samsung or Kingston. The size of the card should be sufficient: if you plan to install heavy games, it is better to choose the option from 64 GB and above.
- 🚀 Speed: Minimum speed class 10 (Class 10) or U3 record 4K video.
- 💾 Volume: Recommended 32GB to 256GB, depending on the support of your smartphone model.
- 🛡️ Reliability: Choose cards with water, shock and X-ray protection.
- 📱 Compatibility: Make sure your slot supports either microSDHC or microSDXC format.
It's important to understand that once formatted with internal memory, the card will be encrypted, the data on the card will only be available on the smartphone on which the formatting was performed, you can't insert it into another phone or computer and read the files without re-formatting.
Preparation of the smartphone and check the support function
Before you start changing partition structure, you need to make sure your device is technically ready for the procedure. Not all Xiaomi models have unlocked the ability to use the card as internal memory at the firmware level.
The first step is to check the version of the operanic system and whether there are updates. Go to the Settings menu → About Phone → MIUI version and check for new versions of the software. Sometimes support for the feature is added in more recent Android or MIUI builds.
☑️ Checking the device's readiness
It is also worth clearing the system cache before starting work to avoid file table conflicts. Go to Settings → Advanced Settings → Memory and assess the current state of storage. If the system does not see the inserted card at all, it may be a problem in the slot itself or the cards contacts.
⚠️ Note: If after inserting the card in the settings menu there is no item "Memory of the device" or formatting options, this means that the manufacturer has blocked the function at the software level.
Method 1: Standard formatting through settings
The safest and easiest method is available to users whose devices officially support Adoptable Storage, in which case the system will prompt you to choose the type of use of the drive immediately after it is detected or when you go to the memory management menu.
To start, remove the map and paste it back in so that the system initiates the process of discovering a new device. Once the notification appears, click on it or manually go to Settings → Memory. Select your card from the list of available deposits.
The system will offer two options: Portable Storage and Internal Storage. Choose the second option. MIUI will warn you if you lose data, confirm the action. The process will take from 1 to 5 minutes depending on the size of the card.
| Parameter | Portable storage | Internal storage |
|---|---|---|
| Access to PC | Possible without limitations | Impossible (encryption) |
| Installation of applications | Media and files only | Full application support |
| Portability | You can move it to other devices. | Linking to a single smartphone |
| Speed of operation | Standard. | Optimized for the system |
Once the process is complete, the system may suggest that you move existing data (photos, contacts, applications) to a new drive, and you should agree to free up space in the main memory, and now your card is part of the system partition.
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After formatting with internal storage, do not remove the card without first unmounting in the settings.Abrupt extraction can cause file system damage and application data loss.
Method 2: Activation through ADB-Teams (for advanced teams)
If the standard menu doesn't suggest selecting "Internal Storage" mode, it doesn't mean the feature isn't available. MIUI It often hides this option, but it remains active in the kernel of the system, USB-cable ADB (Android Debug Bridge).
First, you need to turn on USB debugging mode on your smartphone. Go to Settings → About Phone and quickly press 7 times on the MIUI version until you see the words "You became a developer." Then in the Advanced Settings menu → For developers, activate the Debugging over USB switch.
Connect your smartphone to your computer and open the command line in the ADB folder. Enter the adb device command to check the connection. The phone screen will see a request for debugging permission — tick "Always Allow" and click "OK."
adb shell sm list-disksThis command will show your memory card ID (e.g., disk:179.64) and remember or copy this number, which will be required for the next command that will forcibly format the card.
adb shell sm partition disk:XXX private 100Instead of disk:XXX, substitute your ID. 100 means that 100% of the card’s volume will be given to internal memory. Once the command is executed, the phone can restart, and a new partition will appear in the memory settings.
What if the ADB can’t see the device?
Application portability and data management
Once memory is successfully combined, the system doesn't always automatically transfer all applications to the map, you'll need to manually specify which programs should use the extended storage, allowing you to leave fast system applications on the internal memory, and move heavy games and social networks to SD.
Go to Settings. → Annexes → All applications. Select the program you want (like a game or a navigator). If you can transfer it, you'll see a Change or Memory button. Press it and select it "SD-map" or "External vault".
- 📲 Social networks: Telegram and WhatsApp take up a lot of cache space, they are better to move.
- 🎮 Games: Heavy projects like PUBG Genshin Impact is perfect for the map.
- 📸 Camera: Configure saving photos and videos immediately on SD in the settings of the Camera application.
- 🎵 Music and Video: The Media Library can be completely moved by freeing up the system partition.
Not all applications support portability, but developers may not allow their software to be installed on external drives for security or stability reasons, in which case the transfer button will be inactive or absent.
Possible problems and solutions
Errors may occur during the operation of the combined memory "SD-card damaged" or "Formatting required" This can occur when a card is suddenly removed or power failure occurs during data recording.
If the system stopped seeing the map or the applications stopped running, try remounting. Go to the memory settings, select the card and click "Unmount" and then "Plug in." If that didn't work, maybe the file system got damaged.
⚠️ Attention: Frequent reading errors may indicate physical wear and tear on the memory card. MicroSD cards have limited overwriting cycles. If errors repeat, replace the drive to avoid losing important data permanently.
Another common problem is the slow operation of the interface after transferring system applications, which occurs if the memory card has a low speed class, in which case it is recommended to return system applications to the internal memory, leaving only media files on the map.
Return to factory memory settings
If you decide to sell your phone or replace your memory card with a larger one, you need to properly complete your use of internal storage mode, and simply removing the card will result in the loss of all data on it and errors in the applications that were transferred there.
To return to the original state, go to the memory management menu. Select Format as portable storage. The system will warn you that all applications and data will be removed from the card. Confirm action.
Once the process is complete, the card will be formatted into a FAT32 or exFAT file system, and it can be used in other devices, cameras or card readers to transfer files to the computer.
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Correct completion of work with the memory card through the settings menu guarantees the safety of the smartphone data and prevents the appearance of system errors when you turn on the next time.