Transfer applications to SD card on Xiaomi 7A: Deep customization

Owners of budget smartphones like the Xiaomi Redmi 7A often face a critical shortage of internal storage. The basic version of the device usually has only 16 or 32 gigabytes of internal memory, of which a significant part is occupied by system files. This leads to constant notifications of space shortages, inability to install updates and slow down the interface.

Standard Android settings don’t allow you to simply move executables to a flash drive without losing functionality. However, using hidden system capabilities or special utilities, you can turn an external drive into a full-fledged continuation of internal memory. This process requires care and understanding the structure of the file system, as incorrect actions can lead to data loss. In this article, we will discuss in detail all available methods, risks and nuances of working with Adoptable Storage on MIUI.

Not all apps support portability, even if the system allows you to change the default installation location. Some programs, especially Google system components and MIUI services, are tightly tied to the main section. However, moving cache, media files and some user applications can free up from 5 to 10 gigabytes, which will significantly extend the comfortable use of the smartphone without the need to buy a new model.

Limitations of the MIUI and Android File System

Interface. MIUI, Xiaomi-mounted 7A, It's based on Android, but it has some significant limitations that developers have put in place to keep things stable. SD-It's just a multimedia drive, which means you can save photos, music and documents, but you can put them there. APK-This separation is designed to protect user data and provide speed, since internal memory chips are usually faster than budget microSD cards.

Since Android 6.0, there's a feature called Adoptable Storage in the system's code that allows you to format an external drive so that the system considers it part of internal storage. However, smartphone makers including Xiaomi often hide this option in the standard settings menu. They argue that cheap memory cards have low write speeds, which can cause interface friezes and unstable work of heavy applications. For the Redmi 7A with its Snapdragon 625 processor, this is especially true, since the narrow neck of performance here is the disk subsystem.

⚠️ Warning: The process of formatting the memory card for internal storage will completely destroy all data on it. Be sure to back up photos and documents to your computer or the cloud before starting any manipulation of disk partitions.

There is also a limit on the number of applications you can port, and even if you can activate the extended storage, software developers can prevent the movement of their products. In the application manager, the "Move" item will be inactive (grey), a software restriction that only deals with root rights or through special launchers, but such methods do not guarantee stable operation.

Preparation of memory card and device

Before making software changes, you need to make sure that the equipment is suitable. Not every memory card is suitable for use as a system partition. For the Xiaomi 7A, it is recommended to use drives ranging from 16 to 128 gigabytes. Smaller cards do not make sense due to system overhead, and too large can be incorrectly determined by the phone controller or work unstable.

The minimum standard required is Class 10 or UHS-I. Using slow cards (Class 4 or 6) will result in application launches taking 2-3 times longer, and the system can periodically freeze when accessing data. Ideally, you should choose cards labeled A1 or A2 that are optimized for application work and have high random read/write rates (IOPS).

It is also important to check the physical condition of the slot. SIM/SD In budget models, contacts can become oxidized or weakened, and if the memory card is left off during operation, the system will perceive this as a critical file system error, which can damage installed applications or even bootloop. Before the procedure, it is recommended to clean the card of unnecessary files and check it for the presence of broken sectors with utilities like h2testw computer-based.

Activation method through ADB (No Root rights)

The most secure and common way to get around the MIUI restriction is to use the Android Debug Bridge (ADB) debugging tool, which does not require superuser rights and allows you to activate the hidden formatting function via your computer. You will need to download and install ADB drivers on your PC, and enable the developer mode on the phone itself.

To activate Developer Mode, go to Settings → About Phone and click 7 times in a row on the MIUI Version. After the message “You became a developer” appears, go to Additional Settings → For developers and activate the Debugging switch over USB. Connect your smartphone to your computer with a cable and confirm the debugging permission in the pop-up window on your phone screen.

Next, open the command line or terminal on your computer in the folder with the ADB installed. Enter the adb device command to make sure the device is visible. If that's correct, follow the command to enter the shell: adb shell. Now you need to find your memory card ID. Type the command:

adb shell sm list-disks

And you'll get a string of disk:179.64 (the numbers may differ) that's your drive ID. The next step is formatting. The sm partition command will create the partitions you need. The syntax looks like this:

sm partition disk:XXX,YY private 100

Where disk:XX,YY is your ID and 100 percent of the volume you want to allocate to apps (usually 100 to use the entire card) and once you execute the command, the phone can restart or hang on the MIUI logo for a few minutes, this is a normal procedure for creating an ext4 file system.

Use of third-party launchers and Apps2SD

If the method ADB failed to produce results or the system refuses to format the map, you can try using specialized assistant applications, such as: Apps2SD or Link2SD. These programs work by creating symbolic links, not physically moving the application files, but creating a bridge that makes the system think that the data is in internal memory, even though it is physically located on the computer. SD-map.

These utilities often require a memory card to be split into multiple partitions, the first partition remaining the usual (FAT32/exFAT) for file storage, and the second partition (ext3/ext4) being hidden from the system and used for applications, and can be done directly in the Apps2SD application or through a computer using the MiniTool Partition Wizard. It is important to observe the sequence: first create partitions, then install the application, then transfer.

The main drawback of the linking method is the dependence on mounting partitions when booting. If the memory card does not have time to install before the system starts, applications may not work or disappear from the menu. In addition, some antivirus and system optimizers MIUI may perceive partitioning as suspicious activity and block the utility.

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Use memory cards only from proven brands (Samsung, SanDisk, Kingston). Cheap Chinese counterparts often have a real capacity much less than the declared, which will lead to corruption of data immediately after filling the "fake" volume.

Transfer of media files and application cache

Even if the transfer of the applications themselves (.apk) is impossible or undesirable, you can significantly free up space by transferring their data. Many modern applications, such as Telegram, WhatsApp, Spotify and navigators, store gigabytes of cache, stickers and offline cards. In the settings of the application itself, you can often specify the path to SD-map.

For example, in Telegram, the path changes through Settings. → Data and memory → The path to files. WhatsApp does this through Settings. → chat → Backup chats (although the main media cache is better transferred manually or through a file manager). 2GIS or Yandex Maps folders with cards can simply be cut from the internal memory and pasted into the appropriate directory on the map. SD-map, then in the settings of the application specify a new path.

You should also pay attention to the folder. DCIM and MIUI/gallery/cloud. The default camera can save a photo to a card, but videos are sometimes written into internal memory. Check the camera settings: Settings (cogs) → Additionally. → Save it on. SD-Activating this option will prevent the main storage from filling up quickly during active shooting.

⚠️ Note: When transferring folders with application data (OBB, Data) manually, make sure the application is completely closed. If you move files of a running program, it may give a database error or reset the settings to factory-based.

Possible problems and ways to solve them

There are a lot of challenges in running a smartphone with extended memory, and one of the most common is the slow interface, which happens when the card reads below a certain threshold, the system starts waiting for the drive to respond, and the MIUI animations start to twitch, and the solution may be to clear the card of the extra files or replace the drive with a faster one.

Another common problem is that widgets or app icons disappear after rebooting, which is typical of Link2SD if the partition is not installed in time, and in such cases, flashing the memory management module or abandoning automatic mounting in favor of manually running the script through the terminal helps, and it is also worth checking whether the developer settings include the "Do not turn off the screen", which sometimes conflicts with the background recording processes.

If your phone has stopped seeing the memory card or it is determined to be empty, try formatting it again, but in the standard storage mode (Portable Storage). To do this, select the card from the storage menu and click Format. This will delete all partitions for applications, but return the card to the working state for storing files. In some cases, it helps to update the MIUI firmware to the latest available version, since Xiaomi periodically fixes errors with external drives.

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Use of the SD-The way that internal memory is a trade-off between volume and speed is that you win in gigabytes, but you can lose in system performance, especially on budget models.

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