How to format a memory card on a Xiaomi phone: all the ways and nuances

MicroSD cards remain a popular way to expand Xiaomi’s smartphone memory, especially in the Redmi and POCO series’ budget models. However, over time they start to run slower, give out errors or require complete cleaning before use. Formatting solves these problems, but wrong actions can lead to data loss or even damage to the drive.

In this article, we will discuss all the current ways to format a memory card on Xiaomi, from standard MIUI tools to advanced methods through Recovery and the computer. Learn which file system to choose (FAT32 or exFAT), how to avoid typical errors and what to do if the phone does not see the card after the procedure. And also unique data about hidden MIUI settings that allow you to format the card as internal memory without ADB.

When to format a memory card on Xiaomi

Formatting is not just cleaning files, it's completely resetting the file structure of the drive, and this is necessary in several cases:

• 🔄 The card is slow or slow when writing/reading files (especially for Redmi Note). 10/11 cheap-card A1).
• ❌ The phone will give an error "Memory card is damaged" or "SD-card not supported".
• 📱 You want to use the card as an internal memory (Adoptable Storage function in the computer). MIUI).
• 🔍 The map has "broken" files or it is defined as RAW property.
• 📲 The card was previously used on another device (such as a camera or tablet) and is not displayed correctly in Xiaomi.

It's important to distinguish formatting from simple cleaning. If you just need to delete files, just go to Files → Memory Map and manually delete the unnecessary, formatting completely rebuilds the file system, which can both solve problems and create new ones, for example, if you choose the wrong file system.

⚠️ Note: Formatting erases all data without recovery. If you have important files on a map, copy them to your computer or cloud first. Even programs like Recuva or DiskDigger don't guarantee recovery after full formatting.

Which type of formatting to choose: fast or complete

Xiaomi has two formatting options available, and they differ fundamentally in the result:

MIUI offers fast formatting by default, and to run the full one you need to use a computer or a special utility like SD Formatter, but for most tasks (for example, preparing a card for use as internal memory), there is a quick option.

A hidden nuance: on some Xiaomi models (for example, Redmi 9A or POCO M3), fast formatting through settings may not work with cards larger than 128 GB. In this case, the system will suggest using exFAT, but the procedure will end with an error.

Step-by-step: formatting through Xiaomi settings

The easiest way is to use the built-in MIUI tools. Suitable for cards up to 128 GB (for large volumes, it is better to choose exFAT via PC).

Copy all important files from the card to another media

Charging the battery of the phone – at least 30%

Disconnect the card from other devices (if connected via OTG)

Close all applications that work with SD-map (galleries, music players)-->

Follow the instructions:

1. Open the Settings app (cog icon).
2. Go to the Warehouse section (or Memory on older versions of MIUI).
3. Slip on the Memory Card line (or SD-map).
4. In the upper right corner, press three dots (⋮) and select Storage Settings.
5. Select Format → Format as internal memory (if you need a memory extension) or Format as a portable device (if the card will be used as a removable drive).
6. Confirm the action, wait until it is completed (the phone will restart if you have selected internal memory).

If the option to format as internal memory is inactive, it means:

• 📵 The map is already formatted as internal (you need to cancel this in the settings first).
• 🔋 The phone does not have enough charge (plug in charge).
• 📱 Xiaomi model does not support Adoptable Storage (relevant to Mi flagships) 11/12 s UFS-storage).

⚠️ Note: Once formatted as internal memory, the card cannot be read on other devices without being completely reset, and some apps (such as WhatsApp) may refuse to store data on the card.

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If the phone doesn't see the card after formatting, retrieve it, restart the device and paste it back in. Sometimes cleaning the app's cache helps.

Formatting with Recovery Mode (for power users)

If the card is defined by the system but is not formatted through settings (e.g., it produces a Command '8 volume partition disk' failed error), you can use Recovery mode, which is suitable for cards that the phone "sees" but cannot clear in standard ways.

Instructions:

1. Turn off the phone.
2. Press the Power + Volume buttons up until the Mi logo appears.
3. From the Recovery menu, select the language (usually English by default).
4. Go to Advanced → Format SD card.
5. Confirm the action (on some firmware you will need to enter a password from the Mi-account).
6. After you complete the process, select Reboot → System.

The advantage of this method is that it bypasses the limitations of MIUI and allows you to format cards up to 2 TB (if the phone supports them).

• 🔧 On custom firmware (for example, LineageOS) the option may not be available.
• 🔐 If you forget the password from your Mi Account, formatting via Recovery will not be available.
• ⚡ Some models (POCO F3, Redmi K40) Requires an unlocked bootloader to access Advanced.

Computer Formatting: When It Is Needed

The computer is the most reliable formatting method, especially for 128GB or more cards, allowing you to select a file system (FAT32, exFAT or NTFS), check the map for errors, and perform a complete rewriting of sectors.

The work will require:

• 💻 Computer with Windows/macOS/Linux.
• 🔌 Cardholder (built into a laptop or external USB).
• 📁 Programme SD Formatter (recommended for SanDisk, Samsung, Kingston) or standard system tools.

Step-by-step instructions for Windows:

1. Insert the card into the card reader and connect to the PC.
2. Open This Computer (My Computer), find a removable disk (usually D:\), E:, etc.

Rapid formatting

Start.

For macOS, use the Disk Utility (Application → Utility) and for Linux, use the mkfs command in the terminal. For example, for exFAT:

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

(Replace sdX1 with the current section of your card – check through lsblk).

⚠️ Note: If the card is defined as RAW or Windows suggests formatting it when you connect, don't agree right away. First, check the map for errors using chkdsk: chkdsk D: /f (where D: is the letter of your card. This can restore the file system without losing data.

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For 64–128 GB cards, the exFAT file system is optimal – it supports files over 4 GB (unlike FAT32) and works faster than NTFS on mobile devices.

Which file system to choose: FAT32, exFAT or NTFS

The choice of file system directly affects the compatibility and performance of the card, and in the table below is a comparison based on the features of Xiaomi:

Important nuances for Xiaomi:

• 📱 If you format a card as internal memory, the system will automatically select exFAT for the cards. >32GB.
• 🎥 To shoot a video in 4K/60fps on the Redmi Note 12 Pro+ Xiaomi 13 You need to use exFAT, otherwise the video will be cut to the end. 4 GB.
• 🔄 Maps. FAT32 Slowly work with a large number of small files (for example, Telegram cache or WhatsApp).

If you use the card on multiple devices (e.g. Xiaomi and Sony), choose exFAT, which is supported by all modern gadgets. For maximum compatibility with older devices (e.g. Redmi 4A or the in-car radio), you will have to stop at FAT32.

Typical errors and their solutions

Even with the right formatting, Xiaomi users face challenges.

If the card stopped being defined after a failed formatting, try the following steps:

1. Connect the card to your PC and check in Disk Management (Windows) if it is defined as a disk without a letter. Assign the letter manually.
2. Use the TestDisk utility to restore partitions.
3. If the card is defined as 0MB, it is physically damaged – replace it.

⚠️ Note: Some "Chinese" memory cards (especially cheap ones without a brand) have less than the actual volume stated. After formatting, they can be "reset" to real size (for example, from 128 GB to 16 GB). H2testw pre-purchase.

FAQ: Frequent questions about Xiaomi memory card formatting