Combining a memory card with Xiaomi’s internal drive on MIUI 12: the full guide

Combining an external memory card with Xiaomi’s MIUI 12-based internal storage is a way to expand the available space for applications and data without buying a smartphone with more internal memory. However, the Adoptable Storage feature implemented in Android 6.0+ works on Xiaomi devices with a number of nuances. In this article, we will discuss how to properly combine, what limitations to consider and how to avoid typical errors.

It's important to understand that once combined, the memory card is formatted and becomes part of the system — it can't be removed without data loss. Also, not all Xiaomi models support this feature: on some devices it is hidden or disabled by the manufacturer. We tested the process on the Redmi Note 9 Pro, POCO X3 NFC and Mi 10T with MIUI 12.0-12.5, and the results were mixed. Next is a detailed instruction with explanations for different scenarios.

What is a Memory Unit and Why You Need It

Adoptable Storage is an Android technology that allows you to use an external microSD card as part of an internal drive. Once combined, the system perceives the card as an additional partition of memory where you can install applications and save data, this is true for smartphones with 16/32 GB of internal memory, where free space quickly runs out.

Advantages of association:

• 📱 The ability to install applications on a memory card (even those that don’t normally support portability).
• 📁 Automatic Distribution of Data Between Internal and External Memory.
• 🔄 Improved performance compared to classic use SD-card-like.

However, there are serious limitations:

• ⚠️ The map is formatted in ext4 or f2fs — It will not be read on other devices (for example, on a PC through a card reader).
• ⚠️ Speed depends on the class of the card: for comfortable work you need UHS-I (U1/U3) higher.
• ⚠️ On some Xiaomi models, the function is disabled by the manufacturer (especially on flagships with the mains). UFS 2.1/3.0).

Requirements for a memory card and smartphone

Not every microSD card is suitable for integration, but here are the key requirements:

If your card does not meet the requirements, the system can:

• 🚫 Refuse to format it as an internal memory.
• 🐢 Significantly slow down when working with applications.
• 🔄 Independently disable the connection at high load.

⚠️ Attention: On devices with UFS 2.1/3.0 (For example, Xiaomi Mi 11, Redmi K40) Unification feature is often blocked. Check support through the Settings menu → Memory.

Step-by-step instructions for combining memory

Before the procedure begins, it is mandatory to:

Make a backup copy of the data from the card|Charge your smartphone at least 50 times%|Use the original card reader (if the card is new)|Check the space available on the internal drive (needs a minimum of 1 GB)-->

Now we move on to the process itself:

1. Insert the memory card into your smartphone. If you've already used it, move the important data to your PC or other storage device.
2. Open Settings → Memory. In the Portable Drive section, tap the name of your card.
3. In the upper right corner, press three dots (⋮) and select Memory Settings.
4. Tap it as internal. The system will warn you of the consequences, confirm the action.
5. Wait until the formatting is complete (it can take up to 10 minutes).
6. After rebooting, check the available space in Settings → Memory. Now the card should be displayed as part of the internal drive.

If the item is not formatted as internal:

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Once combined, do not remove the card without first unmounting through Settings → Memory → Extract. Otherwise, you risk losing data or damaging the file system.

Post-unification problems and solutions

Even if it's a success, it can be difficult.

⚠️ Warning: If after the combination, the smartphone began to overheat or discharge quickly, check the card for authenticity. 128/256 GB) often causes failures in the memory controller.

How to cancel the merger and return the card to its original state

If you want to separate your memory, do it right:

1. Transfer all important data from the card to internal memory or PC.
2. Open Settings → Memory and tap the name of the card.
3. In the menu (three dots in the upper right corner), select Format as a portable drive.
4. Confirm action. The map will be formatted in FAT32/exFAT and removable.

Once disconnected, all data on the map will be deleted, and you can only recover it through specialized utilities (for example, DiskDigger or Recuva), but the chances are minimal.

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Before disconnecting the memory, be sure to transfer the data! the map will be completely cleaned, and it is impossible to restore files with standard means.

Alternatives to Memory Combination on Xiaomi

If your smartphone doesn’t support Adoptable Storage or you don’t want to risk data, consider alternative ways to expand your memory:

• 📲 Manual Application Portability: In Settings → Select the program and click Move to SD-Card (not working for all applications).
• ☁️ Cloud Storage: Mi Cloud, Google Drive or Yandex Disk let you automatically sync photos, videos and documents.
• 🔌 OTG-Drivers: Connect the flash drive through USB-C/OTG-Adapter and use it as a removable disk.
• 📁 Link2SD: Application for manual transfer of application data to the map (requires root).

Each of these methods has pros and cons, like cloud storage, which requires a stable Internet connection. OTG-The drives are not always convenient for constant use. The choice depends on your tasks and the model of the smartphone.

Tips for Optimizing Memory After Combination

To make the most of the combined memory, follow these guidelines:

• 🧹 Clean the app cache regularly through Settings → Memory. → Cleanup.
• 📵 Turn off auto-update apps in Google Play or transfer them to the map.
• 🎥 Save photos and videos directly to the map: in the camera, select Settings → Preservation site → SD-map.
• 🔄 Use it. MIUI Optimizer (in the function lab) for automatic garbage cleaning.

It's also worth tracking the health of the memory card.

1. Install the A1 SD Bench app and check the read/write speed.
2. If the speed is below 10 MB/s, it is time to replace the card.
3. Periodically format the card (once every 6 months) via PC using SD Formatter.

FAQ: Frequent questions about memory integration on Xiaomi