Owners of budget smartphones such as Xiaomi Redmi 7A often face a critical shortage of internal storage. Standard 16 or 32 gigabytes available to the user in today's environment is not enough even for a basic set of programs. Android is overgrown with cache, messengers accumulate gigabytes of media files, and the operating system occupies a significant part of the system partition.
The only rational way out is to use an external microSD card. However, standard MIUI features often limit the user to moving only photos, music and documents, but not the applications themselves, which creates the illusion that it is impossible to solve the problem, although the smartphone technically supports extended storage.
In this article, we will explore advanced methods to circumvent system constraints, and you will learn how to force a system to consider a memory card as part of an internal storage, allowing you to install new games and utilities directly on the external drive, freeing up precious space of the main module.
Preparation of memory card and smartphone for work
Before you start complex manipulations with system files, you need to make sure that the drive used is serviceable and compatible. For Redmi 7A, it is recommended to use Class 10 or higher cards, since older models can significantly slow down the interface.
It's important to understand that the process of formatting a map as an internal storage device will completely destroy all the data on it, so the first step is to back up all the important files to the computer or to the cloud, and once formatted, it will be impossible to recover information using conventional methods without deep expertise.
- 🔍 Make sure the memory card is inserted into the slot before the characteristic click.
- 💾 Copy all important data from card to computer for safety.
- 🔋 Charge your smartphone battery to at least 60% to avoid formatting failure.
⚠️ Note: Using a low-quality memory card in internal storage mode can cause rapid wear and loss of application data.
Once you physically install the map and back up, you can move to the software part. The standard Android settings menu often hides the possibility of a full partition merge, so we'll need access to hidden debugging features.
Activation of the developer mode and debugging via USB
To make changes to the storage structure, you need to get extended permissions through the developer menu. In the MIUI shell, this section is hidden by default for the safety of the average user. Activating this mode allows access to the system's diagnostic tools.
To activate the menu, you need to go to the phone settings and find the "About Phone" item. MIUI» And you can quickly click on it seven times in a row, and it will notify you that you've become a developer, even though you've actually just unlocked the technical settings.
Then you go back to the main settings menu and select "More" where the new "Developers" section will appear. Inside this menu, you need to find the "Debug over USB" switch and activate it. Confirm the action in the pop-up window, agreeing to the warning system.
Once debugging is enabled, the smartphone can request a computer authorization confirmation if it is connected to the PC. To work with the file system through the console, we also need to know the exact map model, which can be found through special ilets or the command line.
Using ADB to Change Storage Type
The most reliable way to transfer applications is to use the Android Debug Bridge tool (ADB). This method allows you to send commands directly to the operating system, bypassing the limitations of the GUI. You need a computer running Windows, macOS or Linux and USB-cable.
First, you need to download and install the minimum set of ADB tools on your computer. Once you connect your smartphone with a cable to your PC, select File Transfer mode in your phone's notifications. The device screen will request permission to debug from that computer — be sure to click "Allow".
Open the command line on your computer in the folder with ADB installed and enter the command adb devices. If the device is identified correctly, you will see the serial number of your Redmi 7A. If the number is labeled "unauthorized", check the phone screen and confirm access.
adb shell sm list-disks
This command will display a list of all the connected drives. The memory card will display with an identifier, such as disk:179.64. Remember or copy this identifier, as it is critical for the next step. Without an exact number, the commands will not work.
What to do if your computer can’t see your phone?
Install the original USB-Check if the drivers are installed. ADB In Windows Device Manager. Try another. USB-port, preferably USB 2.0, as some older Redmi models work better with them.The next step will be to format the map. XXX — Your ID will turn the card into internal memory, the system will reboot, and the process will take some time. MIUI There's a less radical way that doesn't require a computer, but it doesn't work on all versions of the firmware. It uses Xiaomi's hidden test menu of engineering setup, and it allows you to force the mount point to change for certain types of files. To enter the menu, you need to open the standard application "Phone" (caller) and enter a special code. For most Redmi devices, the combination ##6484## or ##3646633## works. If the code is entered correctly, the CIT (Customer Information Test) interface will open. The menu that opens will need to find the section associated with storage or SD card. The interface may differ depending on the version of Android and MIUI. Look for items like "SD Card" or "Storage." There may be an option for formatting or changing the write priority. The option is ADB (Internal) The hidden menu Data Availability on PC/Phone only. In this case, a return to the method of c ADB The only solution to fully expand memory is to set the write priority in the system After successfully formatting the card as internal storage, the Android system automatically begins to redistribute the load. But you can manually control where new files are going to be saved and where you're going to move applications that are already installed. Go to the storage settings, and you'll see the combined storage space. When you install a new application from Google Play or Mi GetApps, the default system will offer installation to the map if the main partition is full, this happens automatically due to the configuration created earlier. Go to "Settings» → «Annexes» → «All applications. Select the desired program. If transfer is possible, the “Move” or “Change” storage button will be active. 📱 Open the settings of a specific heavy application, such as a navigator. 💾 Click the Change Storage button and select SD-map. ⏳ Wait until the data copying process is over without turning off the screen. It's worth noting that Xiaomi and Google's system applications often don't have a move-through function. This is a security limitation, and it's almost impossible to get around it without root rights. Games, social networks and messengers. 💡Use the Cleanup feature in the Security app regularly. The cache of the ported applications may still take up space in the system partition if prevention is not carried out. Possible problems and ways to solve them In the process of operating a smartphone with extended memory, specific errors may occur. Most often, they are associated with instability of memory card operation or conflicts of file systems, and understanding the nature of these errors will help quickly restore the device to work. If the applications from the card stopped running or crashed immediately after opening, it may be that the read speed of the drive has dropped below the critical level, in which case formatting the card again, but with the choice of another file system, for example, exFAT instead of the critical level, will help. FAT32, If the controller supports it. ⚠️ Attention: Once the card is formatted as internal memory, it's encrypted with a specific device, so you can't insert this card into another phone and read the data without completely resetting and losing the information «SD-This is often the case when you take a card out of the way while you're writing data. To avoid this, always use software unmounting through settings before physical extraction. in some cases after the firmware update. MIUI The system can suggest formatting the card as portable, and you can't agree to this if you want to save the applications, you have to select the option "Use as internal" again, which will require you to back up the data again. 💡Stability of the smartphone with applications on SD-The savings on the memory card will lead to interface lags. After all heavy applications have been moved, it is recommended to optimize the system operation. Fragmentation of files on a memory card can reduce response speed over time. Periodic defragmentation (although Android does this automatically by background processes) or simple reboot help keep the speed up. It's also worth revising the autoboot list. Apps residing on the map can take longer to load when the system starts. Disable autorun for rarely used programs in battery and performance settings. This will reduce the load on the Redmi 7A processor in the first minutes after turning on. Remember to check the status of the card regularly. In the storage settings, there is information about wear and occup. If the card is full by more than 90%, its performance drops dramatically. Dele the old files and re-out will require re-cleaning of the files. All apps ported to it will be removed and require re-installation from the store. Competent memory management allows you to extend the life of a budget smartphone for a year or more. 7A With a properly configured memory card, it's much faster than a device with a crowded internal storage. Is it safe to transfer WhatsApp to a memory card? Yes, it's safe and even recommended, because the messenger database is growing rapidly. But make sure the card is reliable so you don't lose your correspondence history. Backup Google Drive regularly. Why do games load longer after you've moved? MicroSD card read speeds are usually lower than the phone's built-in flash memory. It's a physical limitation that leads to increased load times for levels and textures in games.Whether the phone resets after the command ADB? Yes, the disk formatting command causes the device to be forced to restart to apply file system changes. This is the normal behavior of the system. Can I use the card on another phone after transfer? No, the data on the card will be encrypted with the keys of a particular device. To use on another phone, the card will have to format, which will delete all the data.