How to format a memory card on Xiaomi Redmi 9T: all the ways and tips

The memory card in Xiaomi Redmi 9T is not just an extra storage, but a key element to extending the smartphone’s capabilities. Over time, the microSD can start to run slower, give out errors or completely stop being recognized by the system. In such cases, formatting becomes the only solution. But how to do it correctly so that important data is not lost and the card itself is not damaged?

In this article you will find three proven formatting methods (through phone, PC and special utilities), figure out the choice of file system (FAT32, exFAT or NTFS), You'll learn how to recover data after accidental deletion, and you'll get answers to frequent questions. MIUI 12/13, which allow you to format the card as internal memory – a feature not available in the standard Android menu.

Why You May Need to Format a Memory Card

Formatting isn't just about cleaning up data, it's about completely overwriting the file system on the media, and on Redmi 9T, you might need to do that in a few cases:

• 🚨 Read/write errors: The phone writes "Memory card damaged" or "SD-The card is not supported. Often this is due to file system damage after improper extraction.
• 🐢 Slow work: the card opens files for a long time, slows down when recording video in the video 4K. The reason is fragmentation of data or an outdated file system. FAT32.
• 🔄 Change of device: If the card has been used in a camera, recorder or other phone, its file system may not be optimized for the device. MIUI.
• 📱 Use as internal memory: Adoptable Storage in Android allows you to “tie” the card to the phone, but requires mandatory formatting.

It's important to understand that formatting deletes all data irrevocably. If there are important files on the map, try copying them to your PC or the cloud first. If the map is not readable, use recovery software, more on this in the section below.

⚠️ Attention: On Redmi 9T firmware MIUI 12.5+ When you format the card as internal memory, the system automatically encrypts it, which means that once you extract the card, you can't read it on another device without resetting it to the factory settings.

Method 1: Formatting through phone settings

The easiest method is to use the built-in MIUI tools, which is suitable if the card is recognized by the phone, but it does not work stable.

Instructions:

1. Open the Settings → Memory.
2. Scroll down to the Port. 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. → Format as a portable device (or as an internal device if you want to expand your phone’s memory).
5. Confirm the action. It'll take 1-3 minutes.

If there is no Format as an internal, your firmware does not support Adoptable Storage. ADB-commands (described in spoiler below).

Save all data from the map to PC/cloud

Charge your phone at least 50%

Make sure the map is not used by apps (close gallery, music players)

Check the free space on your phone (needs at least 1 GB for temporary files)-->

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

If the phone doesn’t see the card or makes errors, it’s better to format it via a PC, and it’s also the only way to choose an exFAT or NTFS file system that supports files larger than 4GB (relevant to 4K video).

For Windows:

1. Insert the card into the card reader and connect to the PC.
2. Open this computer, find a removable disk (usually D:\, E:\).
3. PKM on the disk → Format.
4. Select the file system: FAT32 is compatible with all devices, but a 4GB limit per file. exFAT is the best option for Redmi 9T (supports large files, fast work). NTFS - only if the card will be used mostly on a PC (on Android, write problems are possible).

Start.

For macOS:

Use the Disk Utility (Programs → Utilities). Select a map, press Erase, specify the exFAT format and the GUID scheme.

1. Use the SD Formatter utility (the official tool from the SD Association).

2. Run the command line on behalf of the administrator and type:

diskpart


list disk




select disk X (where X is your card number)




clean




create partition primary




format fs=fat32 quick

3.If the card is physically damaged, try the utility HDD Low Level Format Tool (but it will delete data permanently).-->

⚠️ Attention: On Redmi 9T s MIUI 12.5+ maps formatted in NTFS PCs may not be recognized for writing (read only), and you'll have to reformat it to exFAT.

Method 3: Using third-party utilities for deep formatting

If standard methods don’t help (e.g., a card is defined as a “RAW” or has a bad sector), specialized programs will be useful:

• 🛠️ SD Formatter, from SD Association – optimizes memory cards, restores factory settings.
• 🔧 MiniTool Partition Wizard – allows you to change the size of the cluster, check for errors.
• 💾 HP USB Disk Storage Format Tool – a utility for low-level formatting.

Example of SD Formatter:

1. Download the utility from the official website.
2. Put the card in the card reader and start the program.
3. Select a drive, specify Quick Format (fast) or Overwrite Format (full, longer, but more reliable).
4. Press Format.

For cards with bad sectors (reading errors), Victoria or HDDScan can scan the media for broken clusters and try to repair them, but if the damage is physical (for example, after a fall or overheating), the card is better replaced.

FAT32

exFAT

NTFS

I don't know/didn't pay attention-->

How to Recover Data After Formatting

If you formatted the card by mistake, don’t despair – there are chances of returning files, but they depend on two factors:

1. Format type: Quick Format makes data easier to recover than full data.
2. Post-formatting actions: If you have written new files to a map, they will wipe the old ones, reducing the chances of recovery.

Recovery programmes:

• 🔍 Recuva (free, simple, suitable for photo/video).
• 📁 EaseUS Data Recovery (paid, but with free test mode).
• 🖼️ PhotoRec (for experienced users, works via command line).

Instructions for Recuva:

1. Install the program on your PC (not on the disk you are recovering from!).
2. Put the card in the card reader.
3. Start Recuva, select the file type (e.g., “Images” or “Video”).
4. Enter the disk (your card) and click Analysis.
5. After scanning, mark the files you want and click Restore (save them to another drive!).

⚠️ Warning: Never save recovered files to the same card you restore them from.

💡

The faster you start recovering from formatting, the better the chances of returning files, the optimal time is the first 24 hours.

Frequent mistakes and their solutions

When formatting a map on Redmi 9T, users face typical problems.

If the card is no longer defined after falling or getting moisture, don't try to format it, which can aggravate the damage.

1. Dry the card in rice or silica gel for 24-48 hours.
2. Try connecting it through another card reader.
3. If it does not help, contact the service center (but the recovery will cost more than a new card).

FAQ: Answers to popular questions