Memory card setup in Xiaomi Redmi 9A: from formatting to data transfer

Xiaomi Redmi 9A is one of the most popular budget smartphones, but its built-in memory (32 or 64 GB) quickly ends when used actively. The microSD card solves this problem, but many users face difficulties in setting it up: the phone does not see the drive, data is not portable, or the speed leaves much to be desired. In this article, a step-by-step instruction with nuances that will help avoid typical errors and make the most efficient use of additional storage.

The Redmi 9A features support for memory cards up to 512GB (officially up to 256GB, but tests show compatibility with large volumes), but simply inserting a microSD into the slot is not enough: it requires the correct formatting, file system selection and default settings to work correctly, and we will analyze all the steps from selecting a card to optimizing its performance, including hidden MIUI settings that are not written in the standard instructions.

1. Memory Card Selection: Which MicroSDs Are Right for the Redmi 9A

Not all memory cards work equally well with the Redmi 9A.

• 🔹 Speed class: minimum class 10 (UHS-I), But for recording video in Full HD better U3 or V30. Class Cards 4/6 It will be slowed down when transferring files.
• 🔹 Volume: from 32 GB to 512 GB. Xiaomi officially claims support up to 256 GB, but tests confirm work with 400 GB+ (provided formatting in exFAT).
• 🔹 Brand: Preference SanDisk, Samsung EVO, Kingston Canvas – Cheap no-name cards are often forged to indicate inflated volume.
• 🔹 File system: Redmi 9A supportive FAT32 (up to 32 GB), exFAT (64 GB) and NTFS (The best option is exFAT.

⚠️ Note: If you buy a used card or with hands, be sure to check it for authenticity using the utility H2testw (Windows or F3 (Linux/macOS). Fake cards may show false volume, but they actually have everything. 4–8 GB of real memory, which will cause data loss when you write large files.

Critical feature of Redmi 9A: Memory card slot combined with second slot SIM (It means that you can use two slots at the same time. SIM-MicroSD and cards are not available, you have to choose.

2. Installation of a memory card: step-by-step instructions

Before installing the microSD, make sure the phone is turned off – this will prevent damage to the slot contacts.

1. Find a slot for SIM-maps on the left side of Redmi 9A (near-volume).
2. Use a paper clip or special key to remove the tray.
3. Place the memory card in the microSD slot (usually marked with an icon) 📷). If you use two SIM-cards, one of them has to be removed.
4. Carefully insert the tray back before the click.

After switching on the phone will be a notification "New" SD-Take your time to press "Configure" - first check if the drive is determined in the system:

• Go to Settings. → Warehouse.
• In the section "Portifical storage" should display your map with the indication of the volume.

If the map is not determined:

• 🔄 Reboot the phone.
• 🔍 Check if the card is inserted correctly (contacts should be facing downwards).
• 🛠️ Try formatting the map on PC in FAT32 or exFAT (see the following section).

3. Memory card formatting: FAT32 vs exFAT

Redmi 9A offers to format the card when you first connect, but standard MIUI settings are not always optimal.

The Redmi 9A is the best choice for the following:

• 📱 Up to 32GB: FAT32 (If the card is used on other devices).
• 📱 From 64GB: exFAT (best performance and no file size restrictions).

How to format the card directly on the phone:

1. Go to Settings. → Warehouse → SD-map.
2. Click Format → select exFAT (or FAT32 for cards up to 32GB).
3. Confirm the action. It'll take 1-3 minutes.

⚠️ Attention: Formatting removes all data from the card! If it had important files on it, pre-copy them on the PC. NTFS over the phone, this will cause recording errors.

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If the phone doesn't offer to format the card in exFAT, extract it, format it on the PC in exFAT, then paste it back in. MIUI automatically recognizes the file system.

4. Set up a memory card as the main storage

One of the most useful features of Android is the ability to use microSD as internal memory, which allows you to install applications directly on a map and expand the storage capacity for system needs.

• ⚡ The card will be encrypted and linked to the phone, and once it's extracted, it will be unavailable on other devices.
• ⚡ Application speed may drop (depending on the card class).
• ⚡ Not all applications support the transfer to SD-map (especially system maps).

How to make a card internal memory:

1. Insert the card and wait for the notification "New" SD-map".
2. Click “Configure” → select “Use as internal memory”.
3. Follow the instructions on the screen. The phone will suggest transferring data from the internal memory to the card (this will take 5-15 minutes).
4. Once completed, restart the phone.

⚠️ Note: If you decide to return the card to portable storage mode, all data on it will be deleted! Also note that once encrypted, the card will not be read on a PC without special utilities (for example, DiskInternals Linux Reader).

Critical: In internal memory mode, the card wears out faster due to the constant writing of temporary files. It is recommended to use cards with a high overwriting resource (for example, SanDisk High Endurance).

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The internal memory mode is only suitable for cards of UHS-I (U3) and higher. on slow cards (Class 10), applications will slow down.

5. Transfer data and applications to a memory card

Even if the card is set up as a portable storage, you can transfer files and some applications to it, and we'll figure out how to do that effectively.

File transfer (photo, video, music):

• 📁 Use the built-in File Manager (MIUI): highlight files → "Move it" → choose SD-map.
• 📁 Set up automatic photo/video saving from camera to map: open the camera → Settings → Preservation site → SD-map.
• 📁 For mass transfer, connect your phone to your PC and copy files through MTP-protocol.

Portability of annexes:

Not all applications can be mapped to see if they're capable of doing this.

1. Go to Settings → Applications → Application Management.
2. Select the application → “Storage” → “Change”.
3. If you're an option "SD-The card is active, click on it and confirm the transfer.

⚠️ Note: System applications (Google Play Services, MIUI Launcher and some games (e.g, PUBG Mobile, Genshin Impact) does not support transfer to the card, and after updating the application, it can automatically return to the internal memory.

6. Optimizing productivity and problem solving

If the memory card is slow or the phone can’t see it, try the following steps:

• 🔧 Error Check: Connect the card to the PC, open Properties → Service → Check it out (Windows).
• 🔧 Cache Clearing: Go to Settings → Warehouse → Clear cache (especially if the card is used as internal memory).
• 🔧 Update MIUI: In some versions of the firmware there were bugs with work SD-Check the relevance of the software in the Settings → The phone. → Updating the system.
• 🔧 Slot replacement: If the card slot is contaminated, gently clean it with a dry brush or compressed air.

Common mistakes and their solutions:

If the card still doesn't work, try testing it on another device, maybe the problem is with the drive itself. 9A supportive SDXC-cards (although they can be physically inserted into the slot).

7.Security and backup

Memory cards are more vulnerable to damage than the phone's internal memory, to avoid data loss:

• 🔒 Regularly copy important files to your PC or cloud (Google Drive, Mi Cloud).
• 🔒 Do not remove the card while recording files (for example, when shooting a video).
• 🔒 Use a cover with protection of the slot from dust and moisture.
• 🔒 Check the map for viruses (for example, through Dr.Web Light).

For backup of data from the card:

1. Connect your phone to your PC through USB-cable.
2. Select File Transfer Mode (MTP).
3. Copy DCIM, Download, Pictures folders to your hard drive.

⚠️ Note: If the card is used as internal memory, the standard file copying is done through the MTP It might not work because of encryption, in which case you can back up with adb pull:

adb pull /sdcard/ C:\Backup\Redmi9A

FAQ: Frequent questions about setting up a memory card in Redmi 9A