How to allow access SD-map on Xiaomi Redmi 9A: All methods (including hidden ones)

MicroSD Memory Card in Xiaomi Redmi 9A — It is a great solution for expanding memory, but sometimes the system blocks access to files, giving out errors like “No read rights” or «SD-The problem is more common after the update. MIUI, When you reset your settings or when you first connect a new drive, 80 percent of the time you're at fault are because of a bad storage setting, a conflict of rights, or a corrupted file system.

In this article, 4 proven ways to unlock access to the SD-map 9A, including hidden functions MIUI, team ADB We'll also look at why the phone can't see the card after it's rebooted, and how to fix it without losing data «SD-Card damaged" or "File system not supported" here you will find a solution.

Why Xiaomi Redmi 9A block access SD-map?

MicroSD access issues on Redmi 9A are usually related to MIUI firmware and Android security policies.

• 🔒 Default storage settings: MIUI It can automatically mount the card as a “portable storage” (with limited rights) instead of “internal memory».
• 📱 Update MIUI: Upgrade to new versions (e.g., with MIUI 12 on MIUI (13) access rights are lost.
• 🛠️ Damaged file system: If the card was retrieved during writing or formatted in the NTFS/exFAT (Redmi. 9A supports FAT32).
• 🔄 Application conflict: Some programs (such as file managers or antiviruses) may block access to external drives.

In 90% of cases, the problem is solved by reformatting the card via the phone or changing the type of storage in the MIUI settings. However, if the card was used on another device (for example, in a camera or PC), manual adjustment via ADB may be required.

⚠️ Note: If the memory card has been formatted in NTFS on PC, Redmi. 9A He can't read it. Just use it. FAT32 (32 GB maximum or exFAT (for cards) >64GB, but with limited support MIUI).

Method 1: Change the storage type in the MIUI settings

The easiest way is to change the work schedule. SD-This allows you to put applications on the map and give you full access to the files.

Instructions:

1. Insert the card into the Redmi 9A slot and wait until it is discovered.
2. Go to Settings → Memory (or Storage).
3. Tap your name on it. SD-Cards (e.g., “128GB memory card»).
4. In the upper right corner, press three dots (⋮) and select "Storage settings».
5. Select “Inner Memory” (if available) or “Format as Internal Storage.”
6. Confirm the action – the phone will warn that all data from the card will be deleted.

Once formatted, the card will become part of the internal memory and will be restored.

• 📌 The card cannot be removed without resetting the phone settings.
• 📌 Some apps (such as WhatsApp or Telegram) may not see files on the internal» SD-map.

Backup your card data | Check the free space (at least 10% of the volume) | Connect your phone to charging (the process can take up to 10 minutes) | Make sure the card is not physically damaged-->

⚠️ Note: If the internal memory option is not available, your card is already formatted in this mode or not supported by your phone.

Method 2: Formatting SD-card

If the card is detected but the files are not opened (the “No access” or “Empty folder” error), normal formatting will help, and this method will delete all the data, but restore the drive to work.

How to format:

1. Open the Settings. → Memory. → SD-map.
2. Click on “Format” (or “Clear”).
3. Select the file system: FAT32 for cards up to 32 GB (maximum compatibility). exFAT for cards >64 GB (may not be supported by some versions of MIUI).

Confirm the action and wait for the completion (it will take 1-5 minutes).

If the map does not work after formatting:

• 🔍 Check it on another device (for example, on a PC through a card reader).
• 🔧 Try formatting on your computer in FAT32 utility-wise SD Formatter.

FAT32|exFAT|NTFS|I don't know.-->

Method 3: Allow access via ADB (for power users)

If previous methods didn’t work, you can manually set access permissions through Android Debug Bridge (ADB), which will help if MIUI blocks the card at the system level.

Instructions:

1. Install ADB on your PC (download Google’s Platform Tools).
2. Turn on Redmi 9A Developer Mode: Settings → About Phone → MIUI Version (Tap 7 times)
3. Activate "Debugging by" USB» In Settings → Additionally. → For developers.
4. Connect your phone to your PC and execute on the command line: adb shell sm set-force-adoptable true
5. Restart your phone and check access to the SD-map.

If the team fails, try an alternative method:

adb shell


sm partition disk:179,64 private

(where 179,64 — identifier SD-maps; can be recognized by the LS team /dev/block | grep mmcblk).

⚠️ Attention: Wrong commands ADB If you're not sure what you're doing, skip this method or see a specialist.

Method 4: Check the card for errors and physical damage

If none of the methods helped, the problem may be the problem. SD-Here's how to diagnose it:

• 🔍 PC Check: Connect the card through the card reader and run the command in Command Prompt (Windows): chkdsk E: /f (Replace E: with the letter of your disk).
• 🛠️ Test for broken sectors: Use the utility H2testw (for Windows or F3 (for Linux/Mac).
• 🔄 Contact check: Clean the contacts of the card with a soft eraser and translate it into your phone.

Signs of physical injury:

• The phone identifies the card, but it “disappears” after the reboot.
• The map heats up during operation.
• Files are lost or damaged spontaneously.

If the card is damaged, you can restore data using programs like Recuva or PhotoRec, but the odds depend on the degree of wear and tear.

💡

Before buying a new one SD-Check the card for authenticity with the help of the utility SD Insight (Android) Many of the "brand" cards on the market are fakes with low capacity.

Frequent mistakes and their solutions

Here are the most common problems with SD-maps on the Redmi 9A and ways of eliminating them:

If the error repeats after all the manipulations, try using another one. SD-map (preferably class) UHS-I Class 10 – Some cheap models may not be compatible with Redmi 9A.

FAQ: Answers to Frequent Questions

💡

If Xiaomi Redmi 9A see SD-The card, check it on another device first. In 30 percent of cases, the problem is with the card itself, not the phone.