Formatting a flash drive on Xiaomi Redmi 9A: a complete guide with tips and warnings

Formatting a flash drive on Xiaomi Redmi 9A is a procedure that every owner of this budget smartphone will sooner or later face. Whether you want to clean the drive before selling, fix reading errors or just prepare it for a new use, the right approach will help to avoid data loss and damage to the memory card. In this article, we will analyze all the available methods, from standard MIUI tools to third-party applications, and also talk about the nuances that make the process safe.

It’s important to understand that Redmi 9A supports microSD cards up to 512GB (officially up to 256GB, but many users are also successful in using large amounts). However, not all file system formats work equally well on this device. For example, exFAT may not be recognized unless the firmware is updated to the latest version. We’ll go into detail on choosing the right format and explain why FAT32 remains the most versatile option for most tasks.

If you’ve never formatted a drive through your phone before, don’t worry: it takes no more than 5 minutes to process, and our step-by-step instructions with screenshots (interface descriptions) will make it even easier. But before you start, make sure that the drive doesn’t have important data – it will be extremely difficult to restore it after a complete clean!

Why you might need to format a flash drive on Redmi 9A

There are several situations when formatting becomes not desirable, but a necessary procedure:

• 📱 Reading errors: The phone stops seeing the flash drive or gives a notification “damaged card” SD». This is often done by formatting.
• 🔄 Change device: If you are transferring a memory card from another phone (especially from Android to iOS or vice versa), you may need to clean up for compatibility.
• 📂 Incorrect file system: For example, the card is formatted into NTFS, redmi 9A Not supported for writing (read only).
• 🚀 Preparation for use as internal memory: Adoptable Storage function in the MIUI requires prior formatting.
• 🔍 Viruses or suspicious files: Complete cleanup removes all hidden threats.

Interesting fact: many Xiaomi users have a problem when the phone "sees" the flash drive but can't write files to it. 80% of the time it is due to an inappropriate file system. For example, exFAT can work unstable on older versions of MIUI (below 12.5). If the formatting problem remains, try updating the firmware.

⚠️ Note: If the flash drive was used as internal memory (Adoptable Storage function), formatting it via the phone will result in the reset of all data, including the applications installed on it.

Preparing for Formatting: What to Do in Advance

Before you click the Format button, follow a few simple steps to avoid unpleasant surprises:

1. Save important data. Move photos, documents and other files to your computer or to the cloud (Google Drive, Mi Cloud). Once formatted, it will be impossible to restore information without specialized programs.
2. Check the health of the flash drive. If the memory card is often turned off or slowed down, it may be physically damaged. In this case, formatting can only aggravate the problem. Use utilities like SD Card Tester (available on Google Play) to diagnose the problem.
3. Charging the phone. Make sure the battery level is above 30%. interruption of the process due to discharge can damage both the flash drive and the phone's file system.
4. Disable Antivirus. Some security applications (such as Avast or 360 Security) may block access to drives during formatting.

If you plan to use the flash drive as internal memory, note that once formatted, it will not be retrievable without losing data. Some applications (such as WhatsApp or Telegram) may not work correctly when transferred to adoptable storage.

Method 1: Formatting with standard MIUI settings

The easiest and safest method is to use the built-in MIUI tools, which are suitable for most tasks and do not require the installation of additional applications.

1. Open the Settings app (the gear icon on the home screen).
2. Go to the Warehouse section (or Memory in some firmware versions).
3. Scroll down and find the item. SD-You can click on the card (or external drive.
4. In the upper right corner, tap three dots (menu) and select Storage Settings.
5. Click Format (or Clean)
6. Confirm the action by selecting the file system: FAT32 is a universal option, but with a file size limit (maximum 4 GB). exFAT supports large files, but may not work on older versions of MIUI.

Wait until the process is completed (usually takes 1-3 minutes).

On Redmi 9A with MIUI 12.5 firmware and below, the formatting option in exFAT may not be available, in which case use FAT32 or upgrade the system.

Make a backup copy of the data|Check the battery charge (>30%)|Close all applications that use the flash drive|Select the right file system-->

⚠️ Note: If the phone gives an error "Map" after formatting SD If the problem persists, the flash drive may be physically damaged. Don't use it to store sensitive data!

Method 2: Use of a file manager (without root rights)

If for some reason the standard method does not work (for example, the Format item is not in the menu), you can use the file manager. Mi File Manager is installed on Redmi 9A by default, but any other one will work too (for example, Solid Explorer or FX File Explorer).

Instructions for Mi File Manager:

1. Open the Files app (the folder icon on the home screen).
2. At the top of the screen, select a tab SD-map.
3. Click on the three dots in the top right corner and select Settings.
4. Scroll down and find the Format item.
5. Confirm the action and wait for the completion.

The advantage of this method is that it does not require super-user rights (root) and works even on locked devices, but the choice of file system is limited here - usually only FAT32 is available.

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If the flash drive is not defined after formatting, try formatting it on your computer in FAT32 format with a cluster size of 32 KB. This often solves compatibility problems with Xiaomi.

Method 3: Formatting via PC (if the phone fails)

If Redmi 9A refuses to format a flash drive (e.g., it gives a Team Not Supported error), you can use a computer, which is also useful if you want to choose an NTFS file system (although Xiaomi does not support writing to NTFS, but can read data).

Instructions for Windows:

1. Remove the flash drive from your phone and connect it to your PC through a card reader.
2. Open This Computer (My PC in Older Versions of Windows)
3. Right-click on the flash drive icon and select Format.
4. Specify the file system: FAT32 for compatibility with Redmi 9A. exFAT - if you need >4GB file support (but check compatibility with your version of MIUI).

Start.

For macOS or Linux, use the built-in Disk Utility (Mac) or the mkfs command (Linux). For example, to format FAT32 on Linux, do:

sudo mkfs.vfat -F32 /dev/sdX1

(Replace sdX1 with your device’s current name, and you can find out by lsblk.)

⚠️ Note: If the flash drive was formatted on a PC in NTFS, And then inserted into Redmi. 9A, The phone will see it, but it won't be able to record files, and to fix that, you'll have to reformat it back to the computer. FAT32 exFAT.

Method 4: Formatting with Third-Party Applications

If standard methods don't work, you can use specialized utilities from Google Play, which offer more options, such as deep formatting or cluster size selection.-3 tested applications:

• 🛠️ SD Card Formatter - the official utility from SD Association, optimized for memory cards. FAT32 exFAT.
• 🔧 AOMEI Partition Assistant - allows you to divide the flash drive into partitions and select the file system.
• 📱 DiskDigger – not only formats, but also restores deleted files (useful if you need to save data before cleaning up).

Examples of using SD Card Formatter:

1. Install the app from Google Play.
2. Open it and select your flash drive from the list.
3. Specify the file system and press Format.
4. Confirm the action and wait for the completion.

Warning: Some applications (like Partition Wizard) require root permissions to work with partitions. On Redmi 9A, getting root can lead to loss of warranty and unstable system performance. If you are not an experienced user, it is best to avoid such utilities.

Frequent mistakes and their solutions

Even if you follow instructions correctly, sometimes you have problems, and here are the most common mistakes and ways to fix them:

If none of the methods worked, it's possible that the flash drive is physically damaged.

• 🔍 Check it on another phone or PC.
• 🛒 If the warranty is still valid, contact the store for a replacement.
• ♻️ If the flash drive is old and slow (class below Class 10), it may be time to buy a new one.

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If the phone says "SD card is write-protected," check the physical lock switch on the flash drive itself (if any). Also make sure the card is not connected to the PC in read-only mode.

FAQ: Answers to popular questions