How to allow access SD-Xiaomi Redmi 9 Pro: from formatting to superuser rights

Xiaomi Redmi 9 Pro is a popular smartphone with support for microSD cards up to 512 GB, but many users face a problem: the system does not see files on the card or blocks the recording. MIUI. In this article, we will discuss all ways to allow access to SD-map, including hidden settings and commands for power users.

Features of Redmi 9 Pro (model) M2003J6A1C) — hybrid-slot SIM-card SIM + microSD: If the memory card is not identified, check the physical connection first: sometimes the contacts get dirty or the card is not fully inserted, but more often the problem lies in software constraints.

1. Verification of physical connection and compatibility

Before digging into the settings, make sure the problem isn't hardware-based.The Redmi 9 Pro supports microSD, microSDHC and microSDXC cards (up to 512GB), but there are nuances:

• 🔹 The map should be formatted in FAT32 exFAT (NTFS unsupported!).
• 🔹 Maximum speed of reading/writing — UHS-I (grade 10).
• 🔹 If you use a nano-SIM adapter, check if the contacts are bent.
• 🔹 Some cheap cards (especially those without a brand) may not be recognized – test on another device.

To eliminate hardware malfunctions:

1. Turn off your smartphone and remove the map.
2. Check the slot for dust or damage (use a flashlight).
3. Insert the card back before the click. If the slot is hybrid, make sure the second one is SIM-card.
4. Turn on the phone and check the drive connection notification.

⚠️ Note: If a message appears after inserting the card "SD-The card is damaged, don't format it right through your phone -- try reading it on a PC first. In 30 percent of cases, the problem is solved by reconnecting or cleaning the contacts with alcohol.

2. Formatting SD-maps through settings MIUI

If a card is defined but files are not read or written, it is likely formatted in an incompatible file system. MIUI offers a built-in formatting tool, but with limitations:

• 📌 The map will be formatted in FAT32 (maximum 32 GB for a single file).
• 📌 All data will be deleted – make a backup copy!
• 📌 If the card is larger than 64 GB, the system will offer exFAT (recommended).

Instructions:

1. Go to Settings. → Memory. → SD-map.
2. Click "Format" (or "Configure" if the card is new).
3. Select the file system: FAT32 – for cards up to 32 GB. exFAT – for cards from 64 GB to 512 GB.

Confirm the action and wait until it is completed (may take up to 5 minutes).

Save important files from the card to the PC|Check the battery charge (minimum 50%)|Close all applications using the map|Make sure the card is not encrypted-->

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If the card still doesn't work after formatting, try formatting it on a PC using the SD Card Formatter program from the SD Association, which is better at repairing damaged sectors.

3. Configure access rights for applications

Frequent problem on MIUI — Applications do not see files SD-This is because of Android security policy, where access to external drives requires explicit permission:

For file managers (such as Mi File Manager or Total Commander):

1. Open the application and go to the section "SD-map".
2. When you first access, a permission request will appear – click “Allow”.
3. If the request does not appear, clear the app cache in Settings → Applications → [File Manager Name] → Storage → Clear the cache.

For other applications (cameras, galleries, instant messengers):

1. Go to Settings → Applications → Permissions Management → Storage.
2. Find the right application and turn on the switch "SD-map".
3. Some applications (such as WhatsApp) may require manually specifying the path to the map in the app settings.

⚠️ Note: Some apps (such as Netflix or Spotify) do not support data retention on a basic basis. SD-owing DRM-It's not a bug, it's a feature of their security policy.

SanDisk|Samsung|Kingston|Transcend|Another mark.|I don't use it.-->

4.Use of SD-The card is an internal memory (adoptable storage)

If you need to expand the internal memory of the smartphone, MIUI allow SD-This mode is called Adoptable Storage and has pros and cons:

• ✅ Applications can be installed on a map.
• ✅ Cache files and application data are stored on the map.
• ❌ The map becomes “tied” to the device – on another smartphone it can not be read without formatting.
• ❌ The speed depends on the class of the card (recommended). UHS-I U3).

How to turn on:

1. Put it in. SD-smartphone-card.
2. When the notice “New” appears SD-map" press "Configure".
3. Select "Use as an internal memory".
4. Follow the instructions on the screen (the process will take 5-10 minutes).

Important: once converted to internal memory, the card cannot be retrieved without losing data, and some applications (such as banking) may refuse to work with external memory for security reasons.

5. Access permission via ADB (for power users)

If standard methods don’t work, you can manually give permission to write via Android Debug Bridge (ADB), a method that requires a PC and basic command line knowledge, but solves 90% of access problems.

Step-by-step:

1. Download and install ADB Tools on PC.
2. Turn on USB debugging on Redmi 9 Pro (Settings → About Phone → MIUI version – tap 7 times, then Additional settings → For developers → USB debugging).
3. Connect your phone to your PC through USB-cable (select "File Transfer" mode").
4. Open the command prompt (Windows) or terminal (macOS/Linux) and type: adb devices Make sure the device is identified (it should appear its name).
5. Adb shell sm set-force-adoptable true adb shell sm set-default-write-to-external true
6. Reboot your smartphone.

If you want to allow access for a particular application (such as Camera), use the command:

adb shell pm grant com.android.camera android.permission.WRITE_EXTERNAL_STORAGE

Replace com.android.camera with the batch name of the desired application (you can find out through App Inspector or adb shell pm list packages).

⚠️ Attention: Teams ADB Reset after resetting settings or updating MIUI. Also, some banking applications can block work on devices with enabled debugging. USB (Turn it off after setting it up).

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ADB is the most powerful tool for managing rights to Android, but it requires caution. Wrong commands can disrupt the system. Always check the syntax before running.

6. Solving the problems with the damaged SD-card

If SD-The card is determined, but the files are not opened or the error "Map is corrupted" appears, try the following steps:

• 🛠 PC error check: Connect the card to your computer via a card reader. Open the Command Prompt (Windows) and type: chkdsk E: /f (Replace E: with the letter of your drive. Wait for the check to be completed and reconnect the card to your phone.

Low-level formatting:

HDD Low Level Format Tool

GParted

Authentication check:

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If the card is physically damaged (for example, after a fall or moisture), data recovery is possible only in specialized laboratories, in which case it is easier to buy a new card - the cost of recovery often exceeds the price.

7. Alternative ways of working with SD-card

If standard methods don’t help, consider alternatives:

• 📁 Cloud Storage: Upload files to Google Drive, Mi Cloud or Yandex Disk, and then download them if necessary.
• 🔌 OTG-Drives: Use a flash drive with an adapter USB-C/OTG. Redmi 9 Pro supports USB OTG, And many flash drives work faster. SD-map.
• 🖥 Network storage (NAS): Configure access to files via a home server or router with USB-port.
• 📱 Wi-Fi Transfer: Apps like Send Anywhere or LocalSend allow you to transfer files between devices wirelessly.

For users who often work with large files (video, RAW-The best solution is a microSDXC card UHS-II For example, SanDisk Extreme Pro (128 GB, V30) It can read up to 170MB/s on the Redmi 9 Pro, which is comparable to internal memory.

FAQ: Frequent questions about SD-maps on Xiaomi Redmi 9 Pro