How do you do it? SD-Main memory card on Xiaomi Redmi 7A: full guidance with warnings

Xiaomi Redmi 7A is a budget smartphone with limited internal memory (16 or 32 GB), which quickly becomes a problem when installing applications or shooting videos. Many users try to solve this problem by connecting a microSD card and making it “main memory.” However, Android does not have a direct function to “make SD the main drive” – instead, it uses the Adoptable Storage mechanism, which has nuances on Xiaomi devices.

In this article, we will analyze all working ways to expand memory on Redmi. 7A: From standard file transfer to forced card formatting as an internal drive (including circumvention of restrictions) MIUI). We also explain why some methods can cause a phone to slow down or lose data, and how to avoid this. MIUI 10–14 and Android 9 Pie, which runs Redmi 7A.

Why? SD-The card does not become the primary memory in one click»

Android 6.0 Marshmallow has Adoptable Storage, which allows you to format microSD as internal memory. However, manufacturers (including Xiaomi) often block or modify this feature. On Redmi 7A, you will face two key limitations:

• 🔹 No option in settings: In the Settings menu → The storage does not have a “Format as internal memory” item, even if the card supports high speed classes (UHS-I, A1/A2).
• 🔹 Limitations MIUI: Xiaomi firmware artificially blocks Adoptable Storage to protect against system slowdown (SD-cards slower than the built-in eMMC memory).
• 🔹 Data loss risk: Formation of data through ADB It can cause failures if the card is of poor quality or damaged.

In addition, even after successful formatting, not all applications will be able to migrate to the SD. For example, system utilities (Google Play Services, MIUI Launcher) will remain in the internal memory. Also, it is worth considering that the performance of the phone can drop by 10-30% when you actively use applications with a mobile phone. SD-Cards (depending on the class of the card).

Preparation: what kind SD-map to choose for Redmi 7A

Not every microSD is suitable for use as a primary memory, but here are the key requirements:

⚠️ Note: Cheap cards without certification (no-name brands) often have an understated real speed. U3 It can actually work like a Class 4, making the phone unusable. Check the reviews on the card model before you buy it, or use utilities like this. SD Card Tester (available on Play Market).

Also consider:

• 📱 After formatting as internal memory, the card cannot be retrieved without data loss (the system will issue errors).
• 🔄 If the card has already been used, be sure to back up the data - formatting will delete everything.
• 🛠️ Cards larger than 128GB may not be supported on Redmi 7A Due to the limitations of the controller.

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Before the purchase SD-Check it for counterfeit using the app SD Insight – it will show the real manufacturer and model of the memory chip.

Method 1: Standard data transfer (without formatting)

If you don’t need to port apps, just photos, videos and documents, use the built-in MIUI tools. This method is secure and doesn’t require technical skills.

How to transfer files:

1. Put it in. SD-card to slot (microSD up to 256 GB is supported).
2. Open the Settings → Storage.
3. Slip on the internal memory, then select a category (e.g. Images).
4. Press Move to Move to SD-Card (if the option is active).

Limitations of the method:

• 🚫 Applications cannot be moved (media files only).
• 📁 System files and cache will remain in the built-in memory.
• 🔄 When you extract the map, the links to the files (for example, in the gallery) will disappear.

To automate the transfer of new files:

1. Open the Camera app.
2. Go to Settings → Save Place.
3. Choose. SD-map.

Method 2: Formatting SD as internal memory via ADB

It's the only working way to do this. SD-The card "main memory" on Redmi 7A, but he demands ADB (Android Debug Bridge) and could cause crashes. on some firmware MIUI This method is blocked – if the command fails, go back to Method 1 or 3.

Step-by-step:

1. Turn on USB debugging: Go to Settings → About Phone. Tap 7 times on MIUI to activate Developer Mode. Go back to Settings → Additional → Developer. Activate USB Debugging.
2. Connect your phone to your PC: Use the original USB Type-C cable. On your phone, select File Transfer (MTP) mode.

Install ADB on your computer

• Download the Google Platform Tools.
• Unpack the archive in the folder C:\adb.
• Open the Command Prompt in this folder (Shift + PCM → Open the PowerShell window here).
• Follow the commands: adb devices (should appear device, confirm access on the phone) adb shell sm list-disks (remember the disk ID, for example, disk:179,64) sm partition disk:179,64 private

⚠️ Warning: After the last command, all data on the map will be deleted and the phone will start the migration process (may take 10–30 minutes). Do not interrupt it or remove the card! If the Not allowed to partition disk error appears, your firmware will block the function (see Method 3).

After the reboot:

• 📱 SD-The card will be displayed as part of the internal memory.
• 🔄 Application portability will be available in Settings → Annexes → [Select an application] → Warehouse → Change.
• ⚠️ Not all apps support portability (e.g. WhatsApp, Banking apps).

Method 3: Manually link folders (symlink) without formatting

If ADB didn't work, and you need to port apps, you can use symbolic links, which doesn't format the map, but requires root rights, or ADBs with superuser rights.

Advantages:

• 🔹 Not lost data on SD-map.
• 🔹 You can choose which folders to transfer (for example, only Telegram cache).
• 🔹 Less risk of system slowdown.

Instructions:

1. Connect your phone to your PC and activate ADB (see Method 2).
2. Create a folder on SD-For example, the adb shell mkdir /storage/1234-5678/AndroidData (substitute 1234-5678 real ID yours SD-You can find it by the adb shell ls command. /storage).
3. Move the folder with the application data (for example, WhatsApp): adb shell mv /sdcard/Android/data/com.whatsapp /storage/1234-5678/AndroidData/
4. Create a symbolic link: adb shell ln -s /storage/1234-5678/AndroidData/com.whatsapp /sdcard/Android/data/com.whatsapp

⚠️ Note: Not all apps work properly with symbolic links, for example, Google Play may give an error of 927 when updating such applications. MIUI links can be dropped.

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Symbolic links are a compromise for porting data without map formatting, suitable for advanced users ready to manually configure after system updates.

Method 4: Using applications for portability (without root)

If the previous methods seem complicated, you can use third-party utilities. They won't. SD-A card with a “full internal memory” but will help make room.

Top.-3 supplant 7A:

How to use AppMgr III:

1. Install an app from the Play Market.
2. Open the Movable tab – here you will see the applications that can be moved.
3. Select the app and select Move to SD card.
4. Confirm the transfer (may take a few minutes).

⚠️ Note: Some applications may not work as well after the transfer (for example, Viber notifications or Facebook notifications.

Frequent Mistakes and How to Avoid Them

When working with SD-map 7A And users are faced with typical problems. Here's how to solve them:

• 🔌 The phone can't see. SD-card: Check if the card is inserted correctly (contacts should be clean). Reboot the phone. Format the card into the card. FAT32 or exFAT via PC.
• 🐢 The phone brakes after formatting SD As internal memory: Use a class card A2 or UHS-I U3. Don't put it on. SD heavy-handed (PUBG, Genshin Impact. Clear the cache in Settings → Warehouse → Clear the cache.
• 🚫 You can't move the appendix to SD: Check if the application supports portability (in Settings) → Apps should be a Move button. Update the app to the latest version. Use AppMgr III for forced transfer (risk of failure!).

If after formatting the SD as internal memory, the phone stopped turning on:

1. Extract. SD-map and try to boot up.
2. If it doesn’t help, reset via Recovery (clip Power + Volume up when turned on).
3. Restore the data from the backup (if it was made).

FAQ: Answers to Frequent Questions