How to format a microSD card on a Xiaomi phone: a complete guide with error solutions

Formatting a microSD card on Xiaomi smartphones (including the Redmi, POCO and Black Shark lines) is a procedure that every user will sooner or later face. Whether you want to make room, eliminate read errors or prepare a drive for use as internal memory, it is important to do it correctly. Illiterate formatting can lead to data loss, speed reduction or even card failure.

In this article, we will analyze all the current formatting methods (via phone, computer and application side settings), compare the FAT32, exFAT and NTFS file system, and give recommendations on choosing the best option for your Xiaomi model.

Why you might need to format a microSD on Xiaomi

There are several good reasons to format a memory card:

• 📉 Read/write errors: Phone stops recognizing card, issues notification "SD-Card damaged" or "Unknown format".
• 🔄 Changing the file system: For example, to write files >4GB is required for exFAT instead of FAT32.
• 📱 Use as internal memory: Xiaomi allows you to expand the built-in drive due to microSD, but for this it needs to be formatted as portable storage.
• 🦠 Viruses or suspicious files: Full formatting deletes all data, including malware.
• ⚡ Speed reduction: Over time, flash memory becomes clogged with fragmented data, and formatting helps to return the original performance.

It's important to understand that formatting isn't just about cleaning files, it's about rewiring the drive to create a new file table. So make sure you back up important data before you do it. In some cases (for example, if you're physically damaged), formatting might not help, so you'll need to replace the card.

⚠️ Note: If the card was used in another device (camera, DVR), before formatting on Xiaomi, remove it and check for protection against recording (lever on the adapter).

Comparison of File Systems: FAT32, exFAT or NTFS?

The choice of file system directly affects the compatibility of the card with devices and the limitations on file size.

For most Xiaomi users, exFAT is the best choice: it is compatible with all modern smartphones of the brand, supports files of any size and works faster. FAT32. Exception – if you use the card in older devices (e.g. Redmi) 4A or Mi A1), where there may be no exFAT support. FAT32.

NTFS on Xiaomi smartphones is not catchy: the system recognizes such cards only in read mode, and file writing is impossible. So formatting a microSD in NTFS via a phone is pointless — this can only be done on a PC, but it will not be useful for mobile use.

Method 1: Formatting through Xiaomi phone settings

The easiest method is to use the built-in MIUI tools. Instructions are relevant for all modern models: Xiaomi 13/14, Redmi Note 12, POCO F5, etc.

Save important data from map to PC or cloud

Check the battery charge (minimum 30%)

Make sure that the card is not used as internal memory.

Remove and re-insert the card (to reset the connection)-->

Steps:

1. Open the Settings app (cog icon).
2. Go to the Warehouse section (or Memory on some firmware).
3. Tap the line. SD-card (if not, check if the card is inserted correctly).
4. In the upper right corner, press three dots (⋮) and select Storage Settings.
5. Choose Format → Clean and format (or format as internal if you want to expand your phone’s memory).
6. Confirm the action, wait until the completion (usually takes 1-3 minutes).

If the Format option is inactive, it may mean:

• 🔐 The card is protected from writing (check the physical switch on the adapter).
• 📵 The card is used as internal memory (you need to first transfer the data back to the built-in drive).
• 🚫 File system is corrupted (try formatting via PC).

⚠️ Note: When formatted as internal memory, Xiaomi encrypts the card data, and then it cannot be read on other devices without resetting the phone settings!

Method 2: Formatting via computer (Windows/macOS/Linux)

If the phone refuses to format the card (e.g., it gives a "Team Not Filed" error), try doing it via a PC, which is also suitable if you need an NTFS file system (e.g., to write >4GB files to a camera card).

For Windows:

1. Connect the card to your PC via a card reader (don’t use your phone as an intermediary – this can cause conflicts).
2. Open This Computer (My Computer) and find a removable disk (usually D:, E:).
3. Right-click. → Format.
4. Select the file system (exFAT is recommended), leave the cluster size by default.
5. Click Start and wait until it is completed.

For macOS:

1. Connect the card, open the Disk utility (via Spotlight or Programs → Utilities).
2. Select the card in the left menu, click Erase.
3. Specify the ExFAT format and the GUID Partition Scheme.
4. Confirm the action with the erase button.

For Linux (Ubuntu/Debian):

sudo mkfs.exfat -n "MI_SD" /dev/sdX1

Where /dev/sdX1 is the path to your map (you can find out by lsblk command). Be careful - the wrong drive choice will lead to data loss!

💡

If Windows doesn’t offer exFAT, download the official update from Microsoft’s website: https://www.microsoft.com/ru-ru/download/details.aspx?id=19364 (Windows 7 older).

Method 3: Using Third-Party Applications

If standard methods don't work, specialized tools will come to the rescue.

• 🔧 Format maps with damaged sectors.
• 📊 Select non-standard cluster sizes.
• 🛡️ Restore data before formatting.

Top.-3 Proven applications for Xiaomi:

Instructions for SD Card Formatter:

1. Download and install the utility on the PC.
2. Connect the card through the card reader.
3. Select the drive, specify Quick Format (Fast Format) or Overwrite Format (Full, for damaged cards).
4. Press Format and wait until it is completed.

⚠️ Note: Apps like DiskGenius can show the map as "Uninitiated Disk." In this case, take your time to format - first try to restore data through the Recovery feature.

Solving Common Formatting Errors

Even when following the instructions, Xiaomi users sometimes face problems, and consider the most common ways to fix them:

• 🚫 "Map protected from writing": Check the physical switch on the adapter. If it's not there, the card may have failed. Try formatting it through a PC with the "Fast (cleaning the table of contents) check box removed.
• ❌ "I can't format it. SD-Map": "Maybe the card is being used by the system. Restart the phone and try again. If it doesn't work, remove the card, connect to the PC and use DiskPart: disk part list select disk X (where X is your card number) clean create partition primary format fs=exfat quick
• 🔄 "Formatting is 0% ": This is a sign of physical damage. Try another card reader or USB-If the problem persists, the map is faulty.
• 📵 "Phone does not see card after formatting": Check that you have selected a compatible file system (exFAT or "exFAT") FAT32). If the card is formatted in NTFS, Xiaomi doesn't recognize it.

If the card is defined as having a 0 byte or a "RAW" format, it can be a sign of damage to the controller, in which case only a replacement will help. Before disposing of the card, check the card on another device - sometimes the problem lies in the slot of the phone.

How to Check Card Speed and Health After Formatting

Formatting is only half the battle, and to make sure the card is ready for further use, perform a diagnostic:

1. Speed Check: Install an app on your phone A1 SD Bench (available on Google Play). Run a read/write test. Normal scores for UHS-I map: 📥 Reading: 80-95 MB/s 📤 Record: 20-50 MB/s (depending on the card class).
2. Error Check: On a PC, open Command Prompt on behalf of the administrator. Enter the command: chkdsk X: /f /r where X: is the letter of your card.
3. Authenticity test: Use H2testw (Windows) or F3 (macOS/Linux) to check if the card is tampered with. Fake drives often have understated capacity.

If the write speed is below 10MB/s and the read speed is below 40MB/s, the card is either damaged or fake. In the first case, you can try to restore it using the HDD Low Level Format Tool, in the second case, it is better to replace it with the original one (we recommend the brands SanDisk, Samsung, Kingston).

💡

After formatting, always test the card for speed and errors, which will help to avoid data loss in the future and identify the defective drive in time.

FAQ: Frequent questions about microSD formatting on Xiaomi