Formatting a memory card on Xiaomi: 5 ways and tips for choosing a file system

MicroSD cards in Xiaomi, Redmi and POCO smartphones are often a source of problems, from slow operation to sudden read errors. 80 percent of these problems are solved by simple formatting, a procedure that completely cleans the drive and restores its file structure. But how to do this correctly so as not to lose data and not to spoil the map? In this article, we will discuss all the current formatting methods, including hidden MIUI functions, working through Recovery and even low-level erasure on a PC.

Xiaomi devices are designed to support up to 2TB of cards (on newer MIUI 14+ models), but many users are facing file system limitations, such as FAT32, which prevents you from writing files larger than 4GB, and exFAT may not read on older devices, and we will explain in detail which system to choose for your tasks, whether it is storing movies in 4K, installing applications or backing up.

When to format a memory card on Xiaomi

Formatting is not a panacea, but in some cases it is the only way to get the card back on track. Here are 5 signs that it's time to clean up the drive:

• 📱 The phone doesn’t see the card or makes an error "SD-Card damaged when connected.
• 🐢 Files are copied very slowly (write speeds below 5MB/s on class cards). UHS-I).
• 🔄 The card accidentally turns off during use (especially relevant for Redmi Note) 10/11 hybrid-slot).
• 📁 It is impossible to write files larger than 4 GB (typical for the user) FAT32 on 64-capacity cards+ GB).
• 🚫 Applications are not installed on the map, although the settings allow transfer ("Not enough space").

It's important to distinguish logical errors (corrected by formatting) from physical damage, so if a card overheats, clicks, or is not detected on any device, it's time to replace it, and formatting won't help here.

⚠️ Note: If the card was used as internal memory (Adoptable Storage feature in older versions of Android), formatting it via the phone will result in the reset of all data of the applications installed on it).

Method 1: Formatting through Xiaomi settings (the easiest one)

This method is suitable for most users and does not require a connection to a PC. The instruction is relevant for all smartphones on MIUI 12-14, including Xiaomi 13/14, Redmi Note 12 and POCO F5.

1. Open the Settings. → Memory (or Warehouse).
2. Scroll down to the Portable Drive section (or SD-map) and tap it.
3. In the upper right corner, press three dots (⋮) and select Storage Settings.
4. Tap to format. → Clean and format.
5. Select the file system: FAT32 - for compatibility with older devices (maximum file size 4 GB). exFAT - for cards with a capacity of 64+ GB (supports files up to 16 EB).

Confirm the action and wait until it is completed (usually takes 1-3 minutes).

Once formatted, the card will be automatically reconnected and re-connected, and if that doesn't happen, reboot your phone.

Method 2: Formatting via PC (for 128GB cards and more)

If your phone doesn’t offer the right file system (like NTFS for Windows) or the card isn’t defined in your smartphone, use a computer, which is also useful for low-level formatting that removes all sectors, including those that are corrupted.

You'll need:

• 💻 Windows computer 10/11 macOS.
• 🔌 Cartridge (built-in or external) USB).
• 📁 Programme SD Card Formatter (official instrument from the SD Association) or DiskPart (built-in Windows utility).

Option A: Through SD Card Formatter (recommended)

1. Download the utility from the official website and install.
2. Put the card in the card reader and start the program.
3. Select your drive in the Drive list.
4. Specify the settings: Quick Format - for quick cleaning (check is set by default), Full (Erase) - for deep formatting (takes up to 1 hour on 256 GB), Volume Label - the name of the card (for example, XiaomiSD).

Format

Option B: Through DiskPart (for power users)

This method allows you to format cards in NTFS (useful for >4GB files on Windows), but requires caution – a bug in commands can cause data to be lost on other drives!

diskpart


list disk




select disk X (where X is your card number, look by size!)




clean




create partition primary




formats f=exFAT quick (or fs=NTFS for Windows)




assign letter=G (assign a disk letter)




exit

⚠️ Warning: If the card is not identified in your phone after formatting on your PC, check it on another device. 9A) supportive NTFS — In this case, re-format in exFAT.

Method 3: Formatting with Recovery Mode (for internal memory)

If the card is used as internal memory (Adoptable Storage feature in Android 6-9), standard formatting through the phone settings will not work, in which case Recovery Mode will help.

Instructions for all Xiaomi models with MIUI Recovery (including POCO X3, Redmi K40):

1. Turn off the phone.
2. Press the Power button + Volume up until the Mi logo appears.
3. In the Recovery menu, select the language (if you have an option).
4. Go to Wipe & Reset → Format Data (on some Wipe Data models).
5. Enter the confirmation code (usually yes or leave the field blank).
6. After completion, select Reboot.

Important: This method will completely reset all the data on the phone, including apps and settings. The memory card will be formatted as part of the internal storage. If you need to save the phone data, use method 1 or 2.

💡

Before formatting through Recovery, extract SIM-map SD (If it's not an internal memory, it will speed up the process and avoid accidental erasure.

Method 4: Low-level formatting (for damaged cards)

If the card is defined but is not stable (e.g., losing files or forgetting space), conventional formatting may not help, in which case low-level erasure will help, which restores all sectors of the drive.

Use the HDD Low Level Format Tool (which runs on Windows):

1. Download the program from the official website (free version is limited by speed).
2. Connect the card through the card reader and run the utility on behalf of the administrator.
3. Select your drive in the list and click Continue.
4. Go to the LOW-LEVEL FORMAT tab and click Format This Device.
5. Wait until it is completed (may take several hours for 256+GB cards).
6. After low-level formatting, do the usual through the SD Card Formatter (method 2).

If none of these methods work, the card is likely to be physically damaged, and the only way to do that is to replace it, and use FakeFlashTest or CrystalDiskMark to verify its authenticity and speed.

FAQ: Answers to Frequent Questions