MicroSD cards remain one of the most affordable ways to expand Xiaomi’s smartphone memory, especially for the budget models of the Redmi series or the Xiaomi smartphone. POCO It has 32-64 GB of internal memory, but many users have problems with the first installation: the system does not see the card, offers to format it or does not give you a choice of use (internal / external memory). MIUI, And explain which mode is best to choose for your tasks.
It's important to understand that the procedure differs depending on the version of MIUI (12-14) and the model of the smartphone. For example, on the Xiaomi 13 Pro with MIUI 14, the algorithm is simpler than on the old Redmi Note 8 with MIUI 11. We took these nuances into account and prepared a universal guide that will suit 90% of the brand's devices. If your model behaves outside the box, at the end of this article there is a section with solutions to typical errors.
Preparation of a memory card: which class and volume to choose?
Before you activate a microSD, make sure it is compatible with your Xiaomi. the manufacturer officially supports cards up to 2 TB (on the new flagships), but for most models the optimal range is 64-512 GB.
- 📱 Class 10 / UHS-I (U1) — minimum for application installation (in internal memory mode) Suitable for Redmi 9A, POCO M3.
- 🚀 UHS-I (U3) / A1/A2 — Recommended for flagships (Xiaomi) 12T, 13 Lite. Provides fast recording 4K-video.
- ⚠️ Class 4-6 - only for storing photos/music, when installed in internal memory mode, there will be lags.
Tip: Before buying, check the specifications of your model on Xiaomi's official support site. For example, the Redmi Note 11 Pro+ supports microSDXC up to 1TB, and the POCO X3 NFC only up to 512GB.
Method 1: Activation as an external drive (simple mode)
If you only need to store files (photos, videos, documents), choose this option. The card will appear as a removable disk, and it can be easily retrieved without losing data.
Instructions:
- Insert the card into the slot (some Xiaomi models require you to turn off your phone or use the SIM tray).
- Open Settings → Memory (or Storage in newer versions of MIUI).
- Tap the option. SD-Card (may be called Memory Card).
- Choose Use as external memory (or Portable storage).
- Wait for the check to be completed (usually takes 1-2 minutes).
The map will now be available in the MIUI file manager and the Gallery app, and you can move files manually or use the option to Transfer data in memory settings.
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If the card is not defined, try formatting it on a PC in the FAT32 file system (for cards up to 32 GB) or exFAT (for cards over 64 GB).
Method 2: Configure as internal memory (for applications)
This mode allows you to install applications directly to the map, but has limitations:
- ✅ The card is encrypted and tied to the device - after extraction, the data will be unavailable on other gadgets.
- ❌ Not all applications can be portable (especially system-based and high-performance applications).
- ⚠️ Speed depends on the class of the card: Class 10 is possible to slow down.
How to activate:
- Insert the map and go to Settings → Memory. → SD-map.
- Select Configure as internal memory (or internal storage).
- Confirm the formatting (all data will be erased!).
- Wait for the process to be completed (it can take up to 10 minutes on 256+GB cards).
- After restart, go to Settings. → Annexes → Manage applications, select the desired and tap Transfer to SD-map.
Backup your data from the card | Charge your phone at least 50% | Connect to Wi-Fi (you need to download updates) |Close all background applications-->
Important: In internal memory mode, the card cannot be removed without first "mounting" in the settings, otherwise you risk losing data or damaging the file system.
Hidden MIUI settings for experienced users
If the standard methods don’t work (for example, the formatting button is inactive), try these methods:
- Activate via ADB: Connect your phone to your PC, enable Debugging via USB (Settings → About Phone → MIUI Version – tap 7 times, then return to Additional Settings → For Developers). Enter the command: adb shell sm set-force-adoptable true After that, try formatting in the settings.
- Reset Storage Settings: Go to Settings → System → Resetting → Reset Storage Settings. This won’t delete data, but will reboot the memory management module.
What if the ADB does not recognize the device?
Comparison of modes: external vs internal memory
To choose the best option, study the table:
| Criteria | External memory | Internal memory. |
|---|---|---|
| Installation of applications | ❌ No, only file storage) | ✅ Yes (partially) |
| Speed of operation | 🟢 Depends on the class of the card (but does not affect the system) | 🟡 Possible lags on Class 10 |
| Compatibility | 🟢 The map can be extracted and used on other devices. | ❌ Linked to the phone (encryption) |
| Data portability | 🟢 Manual copying | ✅ Automatic portability of applications |
| Risk of data loss | 🟢 Low (on extraction) | 🔴 High (when resetting the phone) |
Bottom Line: External memory is good for media files and backups, and internal memory is good for applications if there is a critical shortage of space. On flagships (Xiaomi 13 Ultra, 12S Pro), the performance difference is minimal thanks to UFS 3.1, but on budget models (Redmi 10A) it is better not to take risks.
Typical errors and their solutions
Let’s discuss the most common problems:
⚠️ Warning: If the card is not defined after formatting, do not physically remove it! This can damage the slot.
- 🔄 "Map damaged": format it on PC in FAT32 (use the utility SD Card Formatter from SD If it doesn't work, the card is faulty.
- 🔒 "Failed to format: Check if Data Protection is enabled in the security settings, and try another card - the slot may be damaged.
- 📱 "No option to “Configure as internal memory”: On some models (POCO F3, Redmi K40) This function is hidden. ADB, as described above.
- 🔋 "Phone overheats when using the card": Most likely a low-end card (Class 4-6. UHS-I (U3).
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If the card was working normally but suddenly it stopped being detected, check the slot contacts with a flashlight, often the problem is contamination or mechanical damage.
How to transfer data to a memory card?
Once you activate the card, you can transfer files or applications to it. Here's how to do this:
For files (photos, videos, music):
- Open the file manager application (MIUI File Manager).
- Select a category (such as Images or Audio).
- Click Select, tag files and tap Transfer.
- Please indicate the destination SD-map.
For applications:
- Go to Settings → Applications → Application Management.
- Select the app and click Storage.
- Tap Change and specify SD-map.
Note that not all apps support portability, such as WhatsApp and Mi Fit, which cannot be moved to a memory card.