Xiaomi smartphone owners often face a shortage of internal memory, especially if the device is from a budget line (Redmi). 9A, Poco M3) or 3-4 One way to solve this problem is to use it. SD-The card is an internal drive, which expands the scope for installing applications, cache and system files, but this process has some limitations and pitfalls that the manufacturer does not mention.
In this article, we will analyze not only the standard procedure through settings. MIUI, But also alternative methods for devices that are locked, and you'll learn which memory cards are suitable for this purpose, how to avoid data loss when formatting, and what to do if the system refuses to "see" the drive as internal. 12/13 s MIUI 13/14, Where the algorithm differs from the older versions.
What are they? SD-Cards are suitable for expanding internal memory
Not every microSD is suitable for use as an internal drive, and Xiaomi has strict requirements for speed and class, or the system will either refuse to format it or will work with errors.
- 🔹 Speed class: minimum UHS-I (U1), better U3 or A2. Class cards C10 marking UHS won't fit.
- 🔹 Capacity: from 32 GB (on some models at least 64 GB). the maximum depends on the firmware - usually up to 256 GB.
- 🔹 Manufacturer: prefer SanDisk, Samsung EVO, Kingston Canvas – Cheap no-name cards often hang».
- 🔹 File system: before use, the card must be formatted in exFAT or FAT32 (not NTFS!).
⚠️ Note: If you use a class card U1 on an Android 12 smartphone+, Prepare for slowing down applications. The system will constantly move data between slow and slow. SD And it's got a fast internal memory that'll cause lags. X3 Pro and newer recommended class A2.
| Xiaomi model | Minimum SD Class | Maximum volume | Adoptable Storage Support |
|---|---|---|---|
| Redmi 9/9A/9C | U1 (but better than A1) | 256GB | Yes (with limitations) |
| Poco M3/M4 Pro | U3 or A1 | 512GB | Yes. |
| Mi 11 Lite/11T | A2 | 1 TB (theoretically) | Yes (requires manual activation) |
| Redmi Note 8/9 Pro | U3 | 256GB | Yes. |
Preparation SD-maps before conversion
Before you can make a card an internal memory, you have to prepare it properly, and this is a stage that is often missed, and it causes errors like this «SD-The card is damaged" or "Can't format. Follow the checklist:
Back up all data from the card (it will be erased) |
Check the card for errors through PC (utility chkdsk in Windows |)
Format your card in FAT32 or exFAT via phone or PC|
Make sure the card is not encrypted (if used in another device)|
Insert the card into the Xiaomi slot and wait for its recognition-->
If the card was previously used in another phone or camera, it needs to be completely cleaned.
- Connect the card to the PC through the card reader.
- Open the Command Prompt on behalf of the administrator.
- Enter the command: Diskpart list disk select disk X (where X is your number) SD-clean create partition primary format fs=fat32 quick
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If the card is not determined in Xiaomi after formatting, try to disable it in the settings (Settings) → Warehouse → SD-map → Remove, physically remove and re-insert.
Standard method: through MIUI settings
Most of Xiaomi smartphones with Android 9-11 and MIUI 11-12 transformation SD-The cards in the internal memory are available by default:
- Insert the prepared SD-smartphone-card.
- Go to Settings. → Warehouse.
- Tap your name on it. SD-maps (e.g. SanDisk) 128GB).
- In the upper right corner, click on three dots and select Storage Settings.
- Select Internal Memory (or Adoptable Storage in English).
- Confirm the formatting. It'll take 5-15 minutes.
⚠️ Attention: MIUI 13/14 (Android 12+) This menu item may not be available. If it's not available, go to the alternative methods below.
What if the internal memory button is inactive?
Alternative methods for MIUI 13/14 and Android 12+
With the release of Android 12, Google has limited the use of the SD-But there are two ways to get around this limitation, and Xiaomi has followed this trend by removing the option from the interface:
Method 1: Through ADB (without root)
This method works on most models, but requires a PC and an ADB debugging bridge.
- Turn on Developer Mode on your phone: Settings → About Phone → MIUI version (shap 7 times).
- Activate USB Debugging in Settings → Additional → For developers.
- Connect your phone to your PC and execute the command: adb shell sm set-force-adoptable true
- Restart the device and repeat the standard procedure through the settings (see the previous section).
Method 2: Editing the fstab file (requires root)
For owners of phones with unlocked bootloader and Magisk:
- Install a file manager with root support (such as Solid Explorer).
- Go to /vendor/etc/fstab.qcom (or a similar file for your model).
- Find the sdcard string and add the forceadoptable option.
- Save the file, restart the phone and repeat the formatting.
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The ADB method works on 80% of Xiaomi devices from 2019-2023, but may reset after the MIUI update. editing fstab gives a permanent effect, but requires root and is dangerous for beginners.
What to do after the transformation SD-map
After successfully formatting your card as internal memory, follow these steps to avoid problems:
- 📱 Move apps: go to Settings → Annexes → Application management, select the program and click Transfer to SD-map (not all applications support portability).
- 🔄 Set up the default save: in Settings → Warehouse → Preferred place of preservation select SD-photo, video and download card.
- 🛡️ Turn off automatic updates for ported apps (they can “fly” when you update them).
- 📊 Monitor the space available: internal memory SD It runs slower and when it is over 90% full, the phone will start to brake.
⚠️ Attention: If you extract SD-Once converted, all applications installed on the card will stop working, and the system may give up errors when you start. Always use Safe Retrieval in your storage settings.
How to get it back SD-card?
Common mistakes and their solutions
Even if you follow instructions correctly, users face problems, and here are the most common ones and how to fix them:
| Mistake. | Reason. | Decision |
|---|---|---|
| I can't format it. SD-map | Card damaged or incompatible | Check the card on PC via chkdsk, try another U3/A2 card |
| SD-The card is slow. | Class A1 or Data Fragmentation | Replace the card with a faster one or defragment via PC |
| Applications are not portable to SD | Developer has banned the transfer or not enough space | Use AppMgr III applications for forced porting (requires root) |
| After the MIUI update, the map became portable | Resetting storage settings when updating | Repeat the procedure via ADB or settings (see above) |
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If after conversion the phone began to slow down, try to turn off animation in Settings. → For developers → The scale of the animation (switch off) won't speed up the animation itself. SD-map, but make the interface more responsive.
Pros and cons of using SD-maps as internal memory
Before making a decision, weigh the pros and cons:
- ✅ Pluses: 📈 Increased memory for applications (especially relevant for Redmi) 8A with 32 GB of internal memory). 💰 It is cheaper than buying a phone with a lot of memory. 🔄 Ability to transfer data between devices (if the card is returned to portable mode).
- ❌ Cons: 🐢 Slowdown of applications (SD-cardboard A2 into 3–5 time-slower than the built-in memory UFS 2.1/2.2). 🔋 Increased battery consumption due to constant read/write operations. ⚠️ Risk of data loss when card is extracted or crashed. 🔧 Restrictions on porting system applications (e.g. Google Play Services cannot be moved).
A critical nuance for Poco owners F3, Mi 11 and newer: on these models, even after successful conversion, some applications (such as games with high performance requirements) will automatically be installed in the internal memory, ignoring the need to use the device. SD-It's about politics. MIUI performance optimization.