How to combine memory card and internal memory on Xiaomi: a complete guide with nuances

Xiaomi smartphones are some of the most popular devices with support for memory expansion via microSD. But just inserting a card is not enough: to work as part of the main storage, it needs to be properly configured. In this article, we will discuss all the ways to combine memory, including hidden MIUI functions that the manufacturer does not advertise.

The main problem for users is that once the memory card is connected, applications are still installed in internal memory, and files (photos, videos) are stored separately, which leads to fragmentation of data and quick filling of both drives, and we will show how to make the smartphone perceive the card as a single unit with internal memory, including transferring applications and cache.

Importantly, not all Xiaomi models support full integration, for example, flagship devices (Xiaomi 13T Pro, Black Shark 5) are often deprived of this feature due to manufacturer policy, and budget devices (Redmi Note 12, Poco X5) support.

1.Memory consolidation methods: which to choose

On Xiaomi smartphones, there are three options for working with a memory card:

• 📱 Portable storage – the card is used as a removable drive (photos / videos are saved on it, but applications are not available).
• 🔄 Internal memory – the card is formatted as part of the system (you can port applications, but it is tied to the device).
• 🔧 Adoptable Storage (Hidden Android feature) – complete merging with internal memory (does not work on all firmware).

The most reliable way is the second one (inner memory).

• 📲 Install apps directly to the card (including WhatsApp, Telegram).
• 📁 Automatically save files (photos from the camera, downloads from the browser) to the combined drive.
• 🔄 Transfer cache and application data (such as offline Google Maps or Spotify music).

The downside of this method is that once formatted, the card will not be read on another device (it will become "tied" to the smartphone), and the speed depends on the class of the card: for UHS-I (U3/V30), there is almost no difference with internal memory, and on cheap Class 10 applications can slow down.

2. Step-by-step instruction: how to make a card an internal memory

This method works on most Xiaomi devices running MIUI 12-14 (including Redmi, Poco, Black Shark).Be sure to back up your card data before you start – it will be fully formatted!

Follow the steps:

1. Insert the memory card into the slot (if a hybrid slot is used, remove the second one). SIM-map).
2. Open Settings → Memory (or Settings → Storage on new versions of MIUI).
3. Tap on the name of your card (for example, SD-map: 128GB).
4. In the upper right corner, press three dots (⋮) and select Storage Settings.
5. Select Internal Memory → Clean and Format.
6. Confirm the action. The process will take 1-5 minutes (depending on the size of the map).
7. After formatting, restart the phone.

Now the map is displayed as part of the internal memory, so you can transfer the data to it.

1. Open Settings → Applications → Application Management.
2. Select the appropriate app (such as Facebook).
3. Click Warehouse → Change → Select a memory card.

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If the card doesn't show up as internal memory after formatting, try restarting your phone in Safe Mode (press the power button → Safe Mode).

3. Adoptable Storage: Hidden Full Unification Mode

Some MIUI firmware (especially custom ones like Xiaomi.eu or PixelExperience) has Adoptable Storage, which makes the memory card indistinguishable from the internal drive, and the system will automatically distribute data between them.

To activate this mode:

1. Connect your phone to your PC and enable USB Debugging (Settings → About Phone → MIUI Version → 7 times tap on version → go back to Additional settings → For developers).
2. Download and install the Android SDK Platform-Tools on your PC.
3. Open the command prompt (Win + R → enter cmd) and execute: adb shell sm list-disks Remember the disk ID (e.g., disk:179.64).
4. Execute the command to format (replace X with your identifier): adb shell sm partition disk:X private

Once rebooted, the map will become part of the internal memory, and the main difference from the standard method is that the system decides where to store the data, without manual transfer.

⚠️ Attention: On the official firmware MIUI Global Region (Global) ROM) The sm partition command may not work, in which case only manual formatting through settings (section 2) will help).

4. How to transfer applications to a memory card

Even after memory is combined, not all applications can be transferred to the map, for example, system utilities (Settings, Phone) and some games (Genshin Impact, PUBG Mobile) remain in internal memory. However, most programs (social networks, instant messengers, light games) are ported without problems.

Instructions for transfer:

1. Open Settings → Applications → Application Management.
2. Select an application (such as VK).
3. Slip the vault. → Change.
4. Select a memory card and confirm the transfer.

If the Change button is inactive, it means:

• 🚫 The application does not support transfer (most often system-based).
• 🔒 The card is not formatted as internal memory.
• 📵 There is not enough space on the map (at least 10% of free space is needed).

⚠️ Attention: After transferring an application to a map, its performance may drop by 10-30% (depending on the class of the card), especially in games and heavy programs. If the brakes are critical, move the application back.

5. Frequent errors and how to fix them

When you combine memory, users face typical problems, and let's look at the most common ones and how to solve them.

❌ Error: “Memory card damaged"

Reasons:

• 🔋 The map was removed without a safe shutdown.
• 🛠️ File system is corrupted (often after use on PC).
• 🔄 Incompatible format (e.g., exFAT instead of exFAT) FAT32).

Decision:

1. Connect the card to your PC and format it in FAT32 (use the SD Formatter utility).
2. If it doesn’t work, try another card (the current one may be physically damaged).

❌ Error: “Not enough space on the device” after the combination

This happens if:

• 📉 The card is over 90% full (the system reserves cache space).
• 🔧 Applications are not automatically transferred (you need to do manually).
• 🗑️ System garbage takes up space (clean through Settings) → Memory. → Cleanup).

❌ Error: “The application does not work after the transfer"

Some programs (especially security games) refuse to run from a memory card.

• 🔄 Transfer the app back to internal memory.
• 📥 Reinstall it (sometimes helps).
• 🛠️ Use it. Link2SD (requires root) for forced transfer.

6 How to bring it all back: Abolition of the union

If you're going to split a memory or sell a card, you need to untie it from your phone.

1. Open the Settings → Memory.
2. Tap the memory card. → three-point (⋮) → Formatting as a portable device.
3. Confirm the action. All data from the map will be deleted!

The card can then be retrieved and used in other devices, unless the option to Format as a portable device is available:

• 🔧 Use PC: paste the card into the reader and format it through Disk Utility (Mac) or Disk Utility (Windows).
• 📱 Reset the phone to factory settings (Settings) → The phone. → Resetting settings).

⚠️ Note: If the card was formatted as internal memory and then retrieved without undoing the unification, the phone may stop loading (especially on the phone). MIUI 13+). In this case, you will need to reset via Fastboot.

7. Alternative methods: if the unification is impossible

On some Xiaomi models (e.g. Xiaomi 12 Pro, Mix Fold 2), the memory merge function is disabled by the manufacturer.

• 🔄 Use the card as the primary storage for files:
• 📂 Hand-transfer files:
• 🛠️ Install custom firmware:

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If your Xiaomi doesn’t support memory integration, the easiest way to save space is to set up automatic photo/video saving on the map and manually transfer heavy files (such as movies or music).

FAQ: Answers to Frequent Questions