Owners of Xiaomi Redmi 9 often face the need to expand internal storage using microSD memory cards. However, once the drive is installed, the Android system may not immediately recognize new files or require manual confirmation of access rights for certain applications. This is a standard security procedure implemented in the MIUI shell, which prevents unauthorized reading of data by third-party programs.
Understanding how to manage permissions correctly not only frees up precious space in internal memory, but also ensures that multimedia applications run smoothly. In this article, we’ll go through all the stages of customization, from initial initialization of the card to fine-tuning access rights for specific utilities.
Ignoring system requests or setting the system incorrectly can cause the camera to stop saving photos and the music player to see tracks, so it is important to follow the action algorithm described below carefully to avoid file system conflicts.
Primary installation and initialization of the drive
Before allowing individual applications to access, you need to make sure that the memory card itself is correctly defined by the operating system. Once the microSD is physically installed in the tray, a notification about the new device should appear on the Redmi 9 screen. If this does not happen, check the purity of the contacts and the density of the card.
The system will offer two uses: as a portable storage device or as part of internal memory, and for most users, the first option remains the best choice, since it allows you to easily retrieve the card and transfer data to other devices without losing information.
Importantly, when you first set up, the system may request formatting, which will clear the drive completely, so save important files to your computer or the cloud beforehand, and when you complete the formatting, the map will be available for recording.
- 📱 Insert the card into the phone turned off or use a hot replacement via the menu.
- ⚙️ Wait for the pop-up window with a suggestion to set up storage.
- 💾 Select “Use as a portable storage” for compatibility.
- ✅ Confirm the formatting and wait for the process to be completed.
⚠️ Note: If the system is writing «SD-The card is corrupted" or "Formatting required" immediately after installing a new card, take your time to agree. Try re-extracting and pasting the card again. If the error is repeated on the new card, it may have an incompatible file system (e.g., exFAT instead of exFAT) FAT32 small-scale).
Once you've successfully initialized it, you'll have a new partition in the File Manager, and you can now move on to configuring access rights for programs that need to write to an external medium.
Managing permissions through application settings
In the Android operating system that runs MIUI, every application must have explicit permission to access files, not only for reading, but also for writing data to external drives, and without this step, many programs will run in limited mode.
To set up, go to the main settings menu on your smartphone, where you have the control center for all installed programs, find the section that manages applications, and select from the list the program that doesn't see yours. SD-card (for example, file manager or gallery).
Inside the app menu, we're interested in permissions, and that's where the switches to access the various functions of the phone are hidden, and find the item that's associated with the memory or storage, and change its status.
The system can offer several access options: “Only during use”, “Always” or “Disallow”. For stable operation of background processes, such as automatic photo backup, it is recommended to choose a permanent access mode.
- 🔍 Open "Settings» → «Annexes» → «All applications».
- 📂 Select the desired application from the list (for example, “Conductor»).
- 🔐 Click on the item "Application permissions».
- 💽 Find the Memory or Files and Media section and set Allow».
Changes take effect instantly, and you don't usually need to restart your device, but if you're already running an application, you'd better close it completely through Task Manager and reopen it.
Configure access through File Manager
Xiaomi’s standard Mi Drop Explorer or Explorer sometimes requires separate authorization when you first access an external drive, a security mechanism that prevents the system files or other users’ data from being accidentally deleted.
When you first try to copy the file to SD-You can see a map or folder structure, and you can see a system dialog box on the screen that asks you to access the root directory or a particular partition. Don't ignore this window, because without confirmation, the operation will be interrupted.
In some versions of the shell MIUI You need to manually specify the path to the map. To do this, in the access request window, click on the menu icon (usually three bars in the upper left corner) and select your SD-A map from the list of available storage facilities. Then click "Use this folder" or "OK».
⚠️ Be very careful when providing access to the root directory. SD-The cards are to third-party file managers downloaded from unverified sources, and the attackers can use these rights to encrypt your data (encrypting viruses).
Once confirmed successfully, the system will remember this choice for the application, and in the future, no requests will appear, you will not delete the application or reset it to factory settings.
Solving Access and Reading Errors
Even after setting it up properly, there can be situations where the Xiaomi Redmi 9 stops seeing files or gives an access error, most often due to file system logic errors or process conflict.
The first step should always be to reboot the device, which clears the cache of the system and re-mounts the memory card file system, and if that doesn't work, check the card on another device to rule out a physical malfunction.
It's also worth checking if the card itself has Read Only mode on, and some microSD adapters have a physical Lock switch, and if it's moved to the Lock position, the phone can only read data, but not write new ones.
☑️ Diagnosing problems with SD-card
In rare cases, the problem is file system incompatibility. Android works best with FAT32 or exFAT. If the card is formatted in NTFS, the phone can see it, but not have the rights to write without special drivers or root rights.
| Type of problem | Probable cause | Method of decision |
|---|---|---|
| Map not determined | Bad contact or breakdown | Wipe your contacts, check them on another device |
| Recording error | Protective mode (Lock) is enabled | Transfer the switch on the adapter to the unlocked state |
| Files are not visible. | Wrong Path or Hidden Files | Enable the display of hidden files in the Explorer |
| Slow work | Low-speed card class | Replace the card with Class 10 or UHS-I |
If none of the methods help, it is possible that the memory card has exhausted its life cycles and needs to be replaced.
Transfer of applications to SD-map
Many users want to not only store photos, but also transfer the apps themselves to an external map to free up the internal memory of Redmi 9.
The system allows you to transfer to SD-The card only caches and some application data, but not their executable files, and this is done for security and performance, since the internal memory speed is higher than the internal memory.
However, for some programs, portability is available. Go to the app settings, find Memory, and click Change. If the button is active, you can select SD-map as the main storage site.
Why can’t all apps be moved?
You don't have to expect to make room that way, and the bulk of the internal memory will still be occupied by the application's system files.
Features of working with multimedia on an external medium
When setting up the camera and voice recorder, it is important to specify saving files immediately on the SD-This will prevent the internal memory from overflowing at the most inopportune time, and the settings are usually inside the applications themselves.
In the Camera app, click on the menu icon (three bars) in the upper right corner. In the list that opens, find the Save to SD-Now all the new photos and videos will be written to an external drive.
So do the same thing with voice recorders and video editors. For music players, you have to manually add folders with music to the music. SD-The library card, if not automatically displayed.
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Create a separate folder for each type of file on SD-This will speed up the search for the desired data and help file managers index content faster.
Check card occupancy regularly. A crowded drive can run slower and cause malfunctions in applications trying to write new data.
Using a memory card on Xiaomi Redmi 9 is a great way to extend the life of a smartphone without buying a new model. Properly configuring access rights ensures that your data will be safe and the system will work steadily.
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Regular backup of important data from SD-cards to the computer or the cloud is the only guarantee of the safety of information, since external drives are less reliable than the internal memory of the smartphone.