How to format a memory card in a Xiaomi phone: 3 proven ways

Xiaomi’s memory card is not just an extra storage, it’s a full-fledged tool to expand the device’s capabilities. However, over time, a microSD can start to slow down, emit read errors, or even stop being detected by the system. 90% of these problems are solved by banal formatting, but there are nuances: the wrong choice of file system (FAT32, exFAT or NTFS) can lead to file size restrictions or incompatibility with the device.

In this article, we will discuss three official formatting methods (via phone settings, as a removable / internal drive and using a PC), explain why cards with a capacity of more than 32 GB can not be formatted in the format of a card. FAT32 standardized MIUI, And we'll also tell you why, after formatting in Xiaomi, the Redmi Note 12 or POCO X5 The card can disappear from the system and how to fix it.

Preparing for Formatting: What to Do Before Cleaning the Map

Formatting is an irreversible process that erases all data on a memory card, and even if you plan to use microSD as internal storage (the Adoptable Storage function in MIUI), follow these steps first:

• 📱 Backup. Move photos, videos and documents to your PC or cloud (Google Drive, Mi Cloud), especially files from the card you used as internal memory, which will be unavailable once formatted.
• 🔋 Charge your phone. If the process is interrupted by battery discharge, the card may become unreadable. Optimal charge level is at least 50%.
• 🔍 Check the map for errors. MIUI Go to Settings. → Memory. → Memory card and click "Check." If the system finds the bad sector, the formatting may not help, but you'll need a replacement.

If you format the card as internal memory, note that after the procedure, it will not be retrieved and used in another device without re-formatting, and some applications (such as WhatsApp or Telegram) may refuse to work with the “tied” card due to the limitations of Android.

⚠️ Note: On Xiaomi phones with MIUI 14 and later, Adoptable Storage can be hidden. To activate it, you need to turn on developer mode and manually allow formatting through Settings. → The phone. → Version. MIUI (7 times press).

Method 1: Formatting through phone settings (the easiest method)

This method is suitable for most users and does not require a connection to a PC. Instructions are relevant for MIUI 12-14 on models Redmi, POCO and Xiaomi (including Xiaomi 13T, Redmi Note 12 Pro+, etc.).

1. Open the Settings → Memory.
2. Click on the line with your card name (for example, SD-map: 128GB).
3. In the upper right corner, tap three points (⋮) and select Storage Settings.
4. Click Format → Clean and format.
5. Select File System: FAT32 is compatible with all devices, but file limit to 4GB. exFAT is no file size limit, but may not be supported by older devices (e.g. Xiaomi Redmi 4A).

Confirm the action and wait until it is completed (usually takes 1-5 minutes).

If the Format option is inactive, it means:

• 🔹 The card is used as internal memory (you need to first "untie" it in the settings).
• 🔹 The card is protected from writing (check the physical switch on the adapter).
• 🔹 File system corrupted – try the way with PC (see below).

Method 2: Formatting as an internal storage (Adoptable Storage)

This method allows you to use a memory card as part of your phone's main memory.

• 📲 Applications can be installed directly on the card (saves space in the phone).
• 🔄 Data cached faster than on a removable drive.

Disadvantages:

• 🚫 The map cannot be retrieved and read on another device.
• 🐢 The speed depends on the class of the card (recommended). UHS-I U3 higher).

Instructions:

1. Put the card in your phone and wait for it to be determined.
2. Go to Settings → Memory → Memory Map.
3. Click Format as internal (if there is no option, turn on Developer Mode as described above).
4. Read the warning and click Clean and format.
5. Once completed, restart the phone.

⚠️ Note: On some models (POCO F5, Xiaomi 12 Lite) after this formatting, the card can be defined as "damaged" in Windows. That's OK, it's encrypted under your phone. To get compatibility back, format it back as a removable drive.

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If, after formatting as internal memory, apps aren’t installed on the card, clear the Google Play Market cache and restart the phone.

Method 3: Formatting via PC (for cards >32 GB or for errors)

If your phone refuses to format the card (e.g., it gives you a card damaged error), or you need an NTFS file system (for files >4 GB), use your computer.

Option 1: Standard Windows tools

1. Connect the card to the PC through the card reader.
2. Open this computer, find a removable disk (e.g., Disk E:).
3. Right-click. → Format.
4. Choose: 📁 File system: exFAT (for cards) >64 GB) or FAT32 (32GB). 🔄 Cluster size: By default. 📛 Tag: Any name (e.g. XiaomiSD).

Start.

Option 2: Through DiskPart (for power users)

If Windows does not see the card or if it gives an error "Disk is Write Protected", use the command line:

diskpart


list disk




select disk X (where X is your card number)




clean




create partition primary




formats fs=fat32 quick (or fs=exfat)




assign




exit

⚠️ Warning: Clean removes all partitions on the map. If you confuse the disk (for example, choose disk 0 instead of disk 1), you can delete the data from the hard drive of the PC!

Which file system should you choose: FAT32, exFAT or NTFS?

The choice of file system depends on the size of the map and tasks:

• 💾 FAT32: ✅ Compatible with all devices (including the old Xiaomi Redmi) 3S or Mi A1). ❌ File size limit: 4GB (not suitable for video) 4K or large archives).
• 📁 exFAT: ✅ There are no restrictions on file sizes. ✅ Optimized for flash memory (less wear and tear). ❌ Not supported by devices older than 2010.
• 🖥️ NTFS: ✅ Support for files >4 GB, journaling (proof against failures). ❌ MIUI can't work with NTFS "Out of the box – root or third-party apps (e.g. Paragon) will be required NTFS).

For most Xiaomi users, the best choice is exFAT. It is supported by all modern smartphones (starting with MIUI 9) and has no FAT32 restrictions. The exception is if you often connect the card to older devices (for example, Xiaomi Mi 5 or car radio).

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For 64–128GB cards in Xiaomi, it is better to use exFAT – this will eliminate the limitation on file size and increase write speed.

Frequent mistakes and their solutions

Even after formatting, the map may not work properly, and let's look at the typical problems and ways to fix them:

If the card is no longer defined after the MIUI update, try:

1. Reboot the phone.
2. Remove and re-paste the card.
3. Clear the Storage app cache (Settings → Applications → Application Management → Storage → Clear the cache).

FAQ: Answers to Frequent Questions