Lack of space on a smartphone is a problem familiar to many owners of Xiaomi and Redmi devices with a small amount of internal storage. High-resolution photos, videos and instant messenger cache quickly fill gigabytes, forcing the user to look for ways to expand. One solution seems to be combining internal memory with a MicroSD card, which turns the external drive into a full-fledged continuation of the system partition.
However, starting with Android 6.0 and up, Xiaomi’s MIUI shell and the newer HyperOS often hides or completely removes the standard Flexible Storage feature, which is designed to improve system stability and data security, since memory cards are less reliable than embedded chips. However, the technical possibility of combining partitions exists, although it requires more in-depth intervention in device settings.
Before you start taking action, you need to be clear about the difference between simply moving files and completely merging partitions. If you just change the default way of saving, in the second case, the system formats the card, encrypts it, and makes it an integral part of the operating system, which has its advantages, but also carries serious risks of data loss when the drive fails.
Technical limitations of MIUI and HyperOS
Users often wonder why the settings menu doesn’t have a “Combine with internal memory” button, because Xiaomi engineers deliberately restrict access to this feature on most models. The standard interface allows you to format the map as a portable storage, where you store media files, but not applications. SD-cards often below the speed of the embedded eMMC module or UFS, Which can lead to "lags" of the interface.
There is also a problem of file system compatibility. To work as internal memory, the card must be formatted to ext4 with device-specific encryption. MIUI defaults to FAT32 or exFAT, which is readable on computers but does not allow applications to be installed directly there. Bypassing this limitation is possible, but requires the use of special commands via USB debugging.
⚠️ Note: Forced activation of the memory combining function through ADB-The system may stop seeing the card after rebooting if the drive does not have sufficient write speed.
It is important to understand that once combined, the memory card will no longer be readable on other devices without full formatting, all data on it will be encrypted with the keys of a particular Xiaomi smartphone. If you remove the card and paste it into another phone or PC card reader, the system will require formatting, which will lead to irretrievable loss of information.
Preparation of memory card and device
The quality of the drive you choose is critical to the success of the operation, and if you plan to use the card as part of your system memory, you can’t save on the card’s speed class, and cheap low-speed models (Class 4 or Class 6) will be a bottleneck for the entire smartphone, causing long application downloads and interface freezes.
It is recommended to use UHS-I or UHS-II cards labeled A1 or A2, which ensure that the drive is optimized for application use, providing the necessary speed of random access to data. Brands like SanDisk, Samsung or Kingston usually show better compatibility with Xiaomi memory controllers.
Before any manipulations begin, you need to create a complete backup of the data. The process of combining involves formatting, so all photos, contacts and documents will be deleted.
- 📱 Make sure your smartphone battery is at least 60% power to avoid turning off during formatting.
- 💾 Check the memory card for errors by connecting it to the PC through the chkdsk utility or SD Formatter.
- 🔒 Backup important data as recovery after formatting will be impossible.
- 📶 Install the drivers. ADB on your computer if you plan to use the command line method.
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Use the original. USB-Cheap cables may not provide a stable connection for debugging commands, leading to an error of execution.
Method 1: Regular movement of applications
Some versions of MIUI firmware (especially global versions for specific regions) retain the ability to transfer individual applications to a memory card without fully combining partitions, a more secure way that does not require root rights and complex configuration, but it is not available for all programs, since application developers must explicitly specify in the manifest permission to install on external media.
To activate this feature, go to the Settings menu, then select Advanced Settings and find the Memory section. If your version of the system supports flexible storage, there will be an option "Use as internal storage." After selecting, the system will prompt you to format the map and transfer data.
If the standard path doesn't offer unification, try moving apps manually. Go to Settings → Annexes → App management, select the program you want (like a heavy game or a navigator) and click Memory. If the Change button is active, you can choose to use the option. SD-card.
☑️ Verification of portability
It's worth noting that even if you successfully transfer some of the app's data (cache, updates) can remain in internal memory, and this is a feature of Android that prevents failures when you extract the card, so it's unlikely that you can completely free the built-in drive in this way, but it's quite possible to win a few gigabytes.
Method 2: Use of the ADB-team-mates
If the settings menu does not have the necessary options, you can use the Android Debug Bridge tool (ADB). This method allows you to send a hidden command to the system to format the card as internal memory, USB-cable and on-line debugging USB smartphone.
Turn on Developer Mode first. Go to Settings → About Phone and quickly click on MIUI build number seven times. After the “You’re a Developer” notification appears, go back to the main settings menu, open Advanced Settings → Developer Settings → and activate the USB Debugging switch.
Connect your smartphone to your PC and run the command line in the folder with ADB. Enter the command adb shell to access the shell of the device. Next, you need to know the ID of your memory card by entering the command:
adb shell sm list-disksIn the answer, you'll see a disk ID, like a disk:179.64. Remember or copy these numbers. The next step is to create partitions. The sm partition command lets you specify which part of the card to put into the system. Use 100% to combine the entire map:
adb shell sm partition disk:XXX,XX private 100Instead of disk:XXX,XX, substitute your ID. Once you run the command, the system will restart or suggest formatting the drive. Agree. Now the card will be defined as part of internal memory, and you can install the default applications on it.
⚠️ Warning: sm partition completely destroys the data on the card. Make sure you choose the correct disk ID so that you don’t accidentally format your smartphone’s internal memory, which will result in all data loss and the need to flash it back.
What happens if the team returns a mistake?
Comparison of methods of memory expansion
The choice of expansion depends on your goals and technical literacy. The regular methods are safer but less effective. Using ADB gives you complete control, but requires caution. Below is a table comparing the main approaches to solving the problem of space shortage on Xiaomi.
| Parameter | Staff transfer | ADB (Compulsory) | Cloud services |
|---|---|---|---|
| Security of data | Tall. | Medium (risk of loss in case of failure) | Tall. |
| Speed of operation | Depends on the card. | Depends on the map (maybe below). | Depends on the Internet. |
| Difficulty | Low. | Tall. | Low. |
| Availability | Partial (not all applications) | Complete (for all applications) | Tariff-limited. |
As you can see from the table, ADB is the most powerful tool, but also the riskiest: it circumvents the limitations of MIUI, but it makes the memory card device-dependent; cloud services, in turn, do not require physical manipulation, but need a stable connection to the network.
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Compulsory Memory Consolidation Through ADB transform SD-card to the system partition, which increases the speed of applications from the card, but makes it unreadable on other devices without resetting.
Possible problems and solutions
Once memory is combined, users can face a number of problems, most commonly a decline in overall smartphone performance, because the memory controller has to constantly switch between a faster internal chip and a slower card, creating operating system delays.
Another common problem is reading errors: If a memory card is retrieved or a contact is broken, the system can send a message of data corruption and suggest formatting. In the case of combined memory, this means losing all the applications and their data installed on the card, and it will be impossible to recover them without a backup.
System update issues may also be possible: When installing new versions of MIUI or HyperOS, the update process may be interrupted if critical files are temporarily placed on an external partition that the system cannot properly mount in Recovery mode.
- 🐌 Smartphone started to work slower – try to transfer the heaviest applications back to internal memory.
- ❌ Errors appear “Application stopped” – check the card for errors or replace it with a faster one.
- 🔄 After updating the firmware, the card is missing - you will need to re-execute ADB-commands or complete resetting of settings.
⚠️ Note: Do not remove the memory card while the smartphone is on if it was combined with internal memory.This is equivalent to pulling the system disk from a running computer and guaranteed to cause malfunctions in the OS.
Alternative ways to free up space
If the risk of memory consolidation seems too high, there are safer alternatives, most notably the use of the Cleanup feature in Xiaomi’s built-in Security app, which can find duplicate photos, old APK installation files, and social media cache.
The second option is to set up automatic sync of the gallery with the cloud. In the Gallery app, you can enable the option “Free space”, which will delete local copies of photos and videos already uploaded to Xiaomi Cloud or Google Photos, which allows you to store the originals in full resolution on the network, leaving only thumbnails on the device.
The third way is to use lighter versions of apps, and for many popular services (Facebook, Telegram, YouTube), there are versions of Lite that take up significantly less space and consume less resources, especially for low-end models of Redmi with limited memory.