How to completely clean the memory card on the Xiaomi phone: all the ways

The memory card in Xiaomi’s smartphone is eventually clogged with unnecessary files: app cache, duplicate photos, remnants of deleted programs. Even after manually removing garbage, the free space melts away as the system creates temporary files, and some applications (such as Mi Video or Gallery) cache media in hidden folders. In this article, we will discuss 5 working ways to clean microSD, including secure formatting, deep cleaning through the PC and restoring “gray areas” of memory that are not displayed in the explorer.

Xiaomi phones (Redmi Note, POCO, Mi) have a feature that integrates the memory card into the system as an internal drive (Adoptable Storage function), which makes cleaning difficult: standard formatting through settings may not work, and application files remain “tied” to the card, and we will show you how to get around these limitations without losing data and without breaking the smartphone.

1 Preparation: What to do before cleaning

Before you clean your memory card, follow 3 mandatory steps to avoid losing important data or crashing your phone:

• 📱 Backup. Move photos, videos and documents to your PC or cloud (Mi Cloud, Google Drive). DCIM, Download and Android/data — It stores media and game preservation.
• 🔌 Turn off the card as an internal drive (if you used Adoptable Storage). → Memory. → Memory map → Settings (⚙️) → Format like a portable drive.Without this step, standard formatting won't clear Xiaomi system files.
• 📊 Check the actual status of the map. Install the app. A1 SD Bench (free on Google Play) – it will show the read/write speed and identify “broken” sectors that can slow down the phone.

If the card is used as a portable drive (not integrated into the system), the preparation is simplified: just copy the data and extract it from the phone. But remember: even then, some files can be hidden. For example, the.thumbnails folder with thumbnails of photos takes up to 1-2 GB, but you can not see without displaying hidden files.

2. Method 1: Cleaning through the built-in file manager

The easiest method is to use the standard Files by Google or Mi File Manager, depending on the model, which is suitable for removing unnecessary media, documents and cache, but does not clean system files.

Step-by-step:

1. Open the Files app (the folder icon on the desktop).
2. Go to the Memory Card tab (or SD-map).
3. Press three points (⋮) in the upper right corner and select Sort → Size to see the heaviest files.
4. Hold your finger on an unnecessary file/folder, then click on other items for multiple selection.
5. Click Remove (basket icon) and confirm the action.

For deep cleaning:

• 🗑️ Delete folders:.thumbnails – cache of thumbnails (can weigh up to one). 1–2 GB; Download – downloads from the browser; Bluetooth – files received over Bluetooth; Android/obb — cache of games (e.g. Genshin Impact or Call of Duty Mobile may take up a game) 5–10 GB).
• 🔍 Enable the display of hidden files: in Mi File Manager, click ⋮ → Settings → Show hidden files.

⚠️ Note: Do not delete Android folders, MIUI or Xiaomi completely, which can disrupt system applications. Only remove the contents of subfolders (e.g, Android/data/com.miui.gallery).

3. Method 2: Formatting a map through Xiaomi settings

If the card is infected with viruses, runs slowly or is not detected by the phone, full formatting will help, which erases all data without recovery, but returns the card to factory performance.

How to format:

1. Go to Settings → Memory → Memory Map.
2. Click Format (or Clean on newer versions of MIUI).
3. Select the file system: FAT32 is compatible with all devices, but file limit >4 GB; exFAT is for >4 GB files (e.g. 4K video), but may not be readable on older devices; NTFS is not recommended for Xiaomi (may cause errors).

Confirm the action and wait until it is completed (may take 5-15 minutes).

If the formatting option is inactive, the card is used as an internal drive. To unlock it, go to Settings. → Memory. → Memory map → Settings (⚙️) → Format it as a portable drive, and it will delete all the data, including the apps that are installed on the map!

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Once formatted, check the card for errors through the SD Card Tester app (available on Google Play).It tests the speed and integrity of sectors, preventing future crashes.

Method 3: Cleaning through PC (deep scan)

If your phone can't see some of the files or if the card is clogged with system debris, plug it into your computer.

• 🔍 Find hidden files that don’t show up on Xiaomi;
• 🛠️ Use powerful utilities like CCleaner or TreeSize;
• 🦠 Check for viruses (many mobile antiviruses skip threats to the Internet) SD-card).

Instructions for Windows:

1. Remove the card from your phone and paste it into your PC card reader (or connect the phone in USB File Transfer mode).
2. Open This Computer → Find a removable disk (usually D: or E:).
3. Right-click → Properties → Service → Check (to find errors).
4. Run TreeSize Free (download from the official website) to see which folders take up the most space.
5. Delete the unnecessary files, then safely retrieve the card.

For MacOS, use Disk Utility (built-in utility) or CleanMyMac (paid version). Important: MacOS does not support exFAT on older versions by default - you may need to update or install drivers.

⚠️ Note: If the card is defined as RAW (Unknown file system, do not format it immediately! Try to recover data via Recuva or TestDisk, and then check for errors with the chkdsk D command: /f into CMD (Replace D with the letter of your disk).

5. Method 4: Reset the card as an internal drive (Adoptable Storage)

If you've previously configured the card as an Adoptable Storage, standard cleaning methods won't work. MIUI encrypts the data, and you can only delete it through a complete reset.

How to reset:

1. Go to Settings → Memory → Memory Map.
2. Press three points (⋮) → Storage settings.
3. Select Format as a portable drive.
4. Confirm the action. This will delete all data, including the apps installed on the map!
5. After formatting, restart the phone.

If the option is not available:

• 📵 Remove the card and paste back - sometimes it resets the lock.
• 🔄 Update. MIUI Up to the latest version: in the old firmware (MIUI 10 and below) can be bugs with Adoptable Storage.
• 🛠️ Use it. ADB (Adb shell sm list-volumes adb shell sm forget PRIVATE (where PRIVATE — ID your card)

Method 5: Recovery of the "gray areas" of memory

Sometimes the map shows you that the space is occupied, but there are no files in the explorer, and these are the gray areas, the remnants of deleted files, the cache of applications or the system tags, to clear them.

• 🧹 Use it. SD Maid (Android app): Install SD Maid from Google Play. Run a scan (CorpseFinder will find the remnants of deleted applications). Clear the cache of system applications (SystemCleaner).
• 💾 SpaceSniffer visualizes occupied space and finds “invisible” files.
• 🔧 If nothing helps, do a low-level formatting HDD Low Level Format Tool (Destroys all data without recovery!).