How to clean up completely SD-Map on the Xiaomi smartphone: from formatting to speed recovery

SD-map in the smartphone Xiaomi eventually turns into a digital attic: here and duplicate photos from the MIUI Gallery, there's a cache of apps that have been deleted long ago, and there's also some weird files with the.nomedia extension that aren't deleted by standard methods. POCO And the "Not enough memory" notification appears even after all the photos are deleted -- the problem is probably in the microSD. But everyone is afraid of just clicking "Format": what if there are important documents there?

In this article, we will discuss 5 proven cleaning methods, from safe garbage removal to hard formatting to restore the factory speed of the map, focus on hidden MIUI system files, which take up to 30% of memory, but do not appear in the conductor, and also explain how to avoid typical errors (for example, after formatting on Xiaomi 12T, the card becomes “damaged suddenly”).

1.Preparation: What to do before cleaning SD-map

Before you start deleting files, make sure you don't delete something important. Even if you didn't "store anything" on the map, MIUI likes to hide data there without you knowing.

• 📸 Backup copies of photos from MIUI Gallery (daddy.MIUI/Backup)
• 🎵 Offline music from Mi Music (hidden folder.Music)
• 📱 Logs of system applications (for example,.Xiaomi/Logs)
• 🔄 Cache updates (folder.OTA — It can weigh up to 1-2 GB!)

To avoid losing anything:

1. Connect your phone to your PC through USB-cable (file transfer mode).
2. Enable the display of hidden files in Windows Explorer (View → Hidden Items).
3. Copy ALL the card contents onto your hard drive, even what you can’t see on your phone.

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If the card is not determined on a PC, try using a card reader.On some Xiaomi models (for example, Redmi Note 11) when connecting via a computer. USB Only internal memory is available, and SD-map ignored.

Also check if the card is used as an internal storage (the Adoptable Storage feature in older versions of MIUI).

1. Go to Settings. → Memory.
2. Click on the icon. SD-map.
3. If there is a button “Disable” – the card is tied to the system, and it can not be formatted via PC!

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

The easiest method is to use standard Explorer (or Files by Google if installed), which allows you to delete files selectively, but does not show hidden folders, suitable if you need to make room for new photos or videos.

Instructions:

1. Open the Explorer app (the folder icon on the desktop).
2. Go to section «SD-map (or "External Storage»).
3. Sort files by size: click on the three dots in the top right corner → “Sort” → “By size”.
4. Delete large, unnecessary files (such as video in DCIM/Camera or downloads from Download).

What usually takes up the most space:

• 🎥 Video in resolution 4K (1 minute = ~400MB)
• 📁 folder Android/data — Cache of games (e.g. Genshin Impact or Call of Duty Mobile can weigh) 5–10 GB!)
• 📂 Archives and APK-file

Outdated Screenshots in Pictures/Screenshots folder

App cache in Android/data (deleted the next time you run the program)

Duplicate photos (use MIUI Gallery → Albums → Duplicates)

Downloads older than 6 months in Download

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⚠️ Attention: Do not delete folders.android_secure and LOST.DIR — Also avoid folders with a dot at the beginning (for example,.thumbnails) if you do not know their purpose.

Method 2: Deep cleaning via PC (including hidden files)

If you can't see any junk files in your phone and your memory is still busy, plug the card into your computer, which will remove hidden MIUI folders that aren't displayed in your smartphone explorer.

Step-by-step instructions for Windows:

1. Extract. SD-card from your phone and paste it into the card reader (or connect the phone in file transfer mode).
2. Open "This Computer" and find a removable disk (usually D: or E:).
3. Enable the display of hidden files: View → Settings → Change folder settings → View → Show hidden files.
4. Delete the following folders (if any):.MIUI — backups and logs of the.thumbnails system – image thumbnails (can weigh up to a maximum of two times) 1 GB!).Trashes - basket MIUI Android/obb — Cache of games (you can delete, but the games will have to be downloaded again)

For maximum cleaning, use the SD Maid utility (there is a PC version), which finds duplicates, empty folders and residual files after deleting applications, and can be downloaded from the official website: sdmaid.darken.eu.

⚠️ Note: If after deleting the folders, the card is no longer defined, check it for errors through the CHKDSK:

chkdsk E: /f

(Replace E: with the letter of your disk).

Method 3: Formatting SD-cards (full reset)

If the map is slow, it's buggy, or you want to start with a clean slate, full formatting will help, and this method removes everything, including viruses and damaged sectors, but requires a backup.

How to format via phone:

1. Go to Settings. → Memory. → SD-map.
2. Click on the three dots in the upper right corner → “Storage settings”.
3. Select “Format” → “Clean and format.”
4. Confirm the action (a password may be required).

⚠️ Note: On some models (Xiaomi 13 Pro, POCO F5) And when you format it, it can be defined as "damaged." MIUI — Re-formatting via PC in the exFAT file system (not FAT32!).

How to format via PC (more reliable):

1. Connect the card to the computer.
2. Open "This Computer" and right-click on SD-map → «Format».
3. Select the file system: exFAT for cards >64 GB (recommended for Xiaomi) FAT32 for cards <32 GB (obsolete version)

Rapid formatting

Start.

exFAT

FAT32

NTFS

I don't know/I don't look/

other-->

5. Method 4: Cleaning through Recovery Mode (if the card is not formatted)

If SD-The card is now read-only or the phone is giving you a "Map is corrupted" error, try formatting it with Recovery Mode. MIUI sees the map.

Instructions:

1. Turn off the phone.
2. Press the Power button + Volume up until the Mi logo appears.
3. In the Recovery menu, select a language (e.g. English).
4. Go to Mount → Mount SD Card.
5. Go back to the main menu and select the Wipe → Format SD Card.
6. Confirm the action and restart the phone.

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Recovery Mode Formatting is the Only Way to Unblock» SD-card if it is “read-only” due to a file system failure.

Method 5: Restoring the card speed (if it brakes)

In time. SD-cards slow down due to fragmentation and wear of memory cells. If after cleaning the card is still slow (for example, video in the video). 4K It is written in jerks, try the following methods:

1. Check for errors (Windows):

1. Connect the card to the PC.
2. Open the Command Prompt on behalf of the administrator.
3. Enter the command: chkdsk E: /r (replace E: with the letter of your card).
4. Wait until it is completed (may take up to an hour for 128+GB cards).

Speed test:

Install CrystalDiskMark and check the card’s real speed. To work properly with Xiaomi, the following metrics should be used:

• 📊 Reading: at least 80 MB/s (for UHS-I)
• 📊 Record: at least 20 MB/s (otherwise the video will lag)

3. Optimization for video recordings:

If you are shooting 4K/60fps video, the card should support the U3 or V30 speed class.

• 🟢 U3 or V30 — fit 4K
• 🟡 U1 or V10 — Full only HD
• 🔴 No labeling – not recommended for video

⚠️ Note: If the write speed is below 10MB/s, even after formatting, the card is worn out and it is time to replace it.

7.Typical mistakes and how to avoid them

When working with SD-Xiaomi users often face the following problems:

To avoid problems:

• 🔌 Always safely remove the card: Settings → Memory. → SD-map → Extract.
• 📱 Do not use the card as an internal storage function (Adoptable Storage) unless you are ready for the difficulties of retrieving it.
• 🛡️ Periodically check the map for viruses (for example, through Dr.Web Light).
• 🔄 Format a map every 3-6 months to maintain speed.

FAQ: Frequent cleaning questions SD-maps on Xiaomi