Combining a memory card with internal storage on Xiaomi Redmi: the complete guide

Owners of Xiaomi Redmi smartphones often face a lack of internal memory, especially if the model is equipped with a modest 32 or 64 GB. The solution is the use of a microSD card, which can not only be used to store files, but also fully combine with an internal drive.

However, not all users know that MIUI (branded shell Xiaomi) supports two modes of work with memory cards: portable (for transferring files) and internal (for combining with phone memory), the second option requires formatting, but opens up new possibilities. In this article, we will discuss how to configure the association correctly, which Redmi models support the function, and what to do if the system refuses to “see” the card.

Important: The procedure permanently deletes all data from the microSD, so pre-copy important files to the computer or the cloud. Also note that once combined, the card will not be retrieved without resetting the phone settings - it will become part of the system.

Which Xiaomi Redmi models support memory integration?

Adoptable Storage, which allows you to combine the card with internal memory, is available on most Xiaomi devices running Android 6.0 Marshmallow and later.

• 📱 Redmi Note 4/5/6/7/8/9/10 — Supported in full, including models with MIUI 12/13/14.
• 📱 Redmi 4/5/6/7/8/9/10 — function works, but on some firmware may require manual activation through ADB.
• 🚫 Redmi Go and Android Go models are not supported due to the limitations of the lightweight version of the OS.
• ⚠️ Redmi K20/K30/K40/K50 — Officially the function is available, but on some custom firmwares it can be disabled.

To check your model’s compatibility, go to Settings. → Memory. → Map. SD. If there's an option called "Use as internal memory," it means the device supports the unification. ADB-team (more on this below).

Preparation of a memory card: requirements and recommendations

Not every microSD is suitable for combining with a phone’s memory, and Xiaomi has strict requirements for speed and card class.

⚠️ Attention: Cheap cards from nameless manufacturers often have understated characteristics. If the phone starts to slow down after the combination, it is likely that the slow speed of writing the card is to blame, in which case it is better to return the portable mode or buy a certified carrier.

Before the procedure begins:

• 🔋 Charge your phone at least 50% – formatting can take up to 10 minutes.
• 📁 Back up your data from a map to a PC or cloud (Google Drive, Mi Cloud).
• 🔍 Check the card for errors through your computer (in Windows: Properties) → Service → Verification).

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If the card has been used on another device before, format it to exFAT via your computer before connecting to Redmi, which will reduce the risk of errors when combining.

Step-by-step: how to combine a card with a phone memory

The process consists of three steps: connecting the map, selecting the mode and formatting. Follow the instructions carefully - after confirmation, all data from the map will be deleted without recovery.

1. Insert the card into a microSD slot (or hybrid-sim if the model supports only one physical slot). Make sure the phone detects it - a notification will appear in the status bar.
2. Open memory settings: go to Settings → Memory → SD card (on some firmwares, the path may differ: Settings → Additional → Memory).
3. Select Mode: Click on the three dots in the upper right corner and select "Memory Settings" (or "Format as internal").
4. Confirm formatting: the system will warn you to delete the data. Click "Erase and format".
5. Data portability (optional): Once formatted, the phone will suggest transferring some files (photos, videos, some apps) to the map, a step that can be skipped and done manually later.

⚠️ Note: If the phone is formatting an error "Map" SD "damaged," retrieve it, restart the device, and repeat the procedure. If the problem persists, the card is incompatible or damaged.

What if the option “Use as internal memory” is not available?

On some Redmi models (especially custom firmware) the standard way of combining can be hidden. ADB-A team is a tool for developers that allows you to force activate a function.

Instructions for Windows:

1. Download Google’s Platform Tools and unpack the archive to the root of the C:\ drive.
2. Activate USB debugging on your phone: Settings → About Phone → MIUI version (click 7 times until the message “You’re a developer” appears). Then go back to Settings → Additional → Developers → Debugging on USB.
3. Connect your phone to your PC, open Command Prompt (Win+R → cmd) and type: cd C:\platform-tools adb shell sm list-disks Remember the disk ID (e.g., disk:179.64).
4. Enter the command to format (replace X,Y with your identifier): adb shell sm partition disk:X,Y private

Once the command is executed, the phone will automatically restart and the card will be merged with the memory. If the error "Failed to partition disk" appears, check:

• 🔌 Correct connection to USB (Select "File Transfer" mode when connecting).
• 🛠️ Root rights (some firmware required).
• 📋 Correctness of disk identifier.

How to transfer applications to a combined memory card?

Once the card is successfully combined with the memory of the Xiaomi Redmi phone, you can transfer applications to it.

• 📱 Not all programs support transfer (especially system and some games).
• 🔄 Some of the data may remain in internal memory (cache, settings, etc).
• ⚡ The speed of the application depends on the class of the card.

Instructions for transfer:

1. Open Settings → Applications → Application Management.
2. Select the app you want to migrate (such as WhatsApp or Spotify).
3. Click on "Storage" → "Change" → select the SD card.
4. Confirm the transfer. The process may take a few minutes.

⚠️ Note: Do not transfer to the memory card:

• 🔒 Root-rights applications (may disrupt their operation).
• 🎮 Games with high reading speed requirements (e.g. Genshin Impact, PUBG Mobile).
• 📱 System utilities (MIUI Security, Google Play Services).

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Moving applications to a memory card reduces their performance by 10 to 30 percent compared to internal storage, and use this method only for underutilized programs.

Common Problems and Their Solutions

Even after successful integration, Xiaomi Redmi users may encounter errors, and let’s look at typical situations and ways to fix them:

If the card stopped working after the MIUI update, try:

1. Restart your phone in Safe Mode (hold the power button → “Safe Mode”).
2. Clear the storage partition cache via Recovery (turn off the phone → pinch Power + Volume up).
3. Reset the settings to factory (last option if other methods did not help).

How to return the card to portable mode?

If you decide to give up the combined memory, you can return the card to its original state, but this process will also lead to the deletion of all data from it.

Instructions:

1. Transfer all important files from the card to internal memory or to the PC.
2. Open Settings → Memory → SD card.
3. Click on the three dots in the top corner → “Memory settings” → “Format as portable”.
4. Confirm the action. Once formatted, the map can be retrieved.

⚠️ Note: If the card has been combined through ADB, The standard way might not work:

1. Connect the phone to your PC and execute the command: adb shell sm forget X,Y (where X,Y is the card ID received earlier).
2. Reboot the device and format the card via your phone.

FAQ: Answers to Frequent Questions