How to transfer memory to SD-map 4X: full-length instruction

Owners of Xiaomi Redmi 4X Often, they face a lack of internal memory, especially if the device is used as a primary smartphone for photos, videos and applications. Even 16 GB of internal storage quickly fill up, and deleting files or transferring them manually is inconvenient. SD-cards with internal memory through the Adoptable Storage function in Android. MIUI This process has features that are rarely written about in standard instructions.

On the Redmi. 4X (The santoni model can be implemented in two ways: through system settings (if the system is set up). MIUI supports the function or manually through ADB. The first method is simpler, but it doesn't work on all versions of the firmware. The second one requires a computer and minimal command line knowledge, but it works. In this article, we'll discuss both options and also tell you which ones are the best. SD-The cards fit, how to avoid errors and what to do if the system "cannot see" the card after combining.

⚠️ Important: After the merger SD-The card will not be retrieved without losing data. It will become part of the system, and formatting it will cause the smartphone to malfunction. A1 or A2 (For example, SanDisk Ultra or Samsung. EVO Plus) up to 256 GB.

1. Which one? SD-The cards are suitable for memory expansion on Redmi. 4X

Not every microSD is suitable for use as a primary memory. Xiaomi Redmi 4X supports microSDXC cards (up to 256 GB), but speed and class are important for stable operation.

• 🔹 Class speed: UHS-I (U1 or U3) Class 10, or Class 10. U3 preferable for recording video and fast application.
• 🔹 Class of applications: A1 or A2. These cards are optimized for random reading/write of small files (like Android).
• 🔹 Brand: SanDisk, Samsung, Kingston or Lexar, cheap no-name cards are often forged, leading to errors.
• 🔹 Volume: From 32 GB to 256 GB. Cards less than 16 GB may not be accepted by the system for the combination.

⚠️ Note: If you are using a card that previously worked on another device (e.g. a camera), be sure to format it via your smartphone before combining. FAT32 (not NTFS!).

Before buying, check the card for authenticity with H2testw (for Windows) or F3 (for Linux/Mac). Counterfeit products often have a real volume of 2-4 times less than claimed, which will lead to failures after combining.

2. Preparation of the smartphone before combining memory

Before you do SD-Main memory card, follow a few mandatory steps:

1. Back up your data. Memory combination will result in a full map formatting. Use Settings → Additional → Backup and Reset or applications like Mi Mover.
2. Charge the phone at least 50%. The process can take 10 to 30 minutes, and interruption due to battery discharge will lead to errors.
3. Update MIUI to the latest version. In older firmware (below MIUI 10), the memory merge function may not work properly. Check for updates in Settings → About Phone → System Update.
4. Delete unnecessary files. Free up at least 1-2 GB of internal memory, which will speed up the process.

If you are planning to use the ADB method, additionally:

• 🔧 Enable Developer Mode: Go to Settings → About the phone and 7 times click on the version MIUI.
• 🔧 Activate Debugging on USB In Settings → Additionally. → For developers.
• 🔧 Install the drivers. ADB Download from the Android Developers website).

Method 1: Connecting via MIUI settings (without PC)

If your firmware supports Adoptable Storage (available in MIUI 10 and later), follow these steps:

1. Put it in. SD-slot 4X (Only Slot 2 is supported if two are used. SIM-map).
2. Open the Settings → Memory.
3. Click on your name. SD-maps (e.g. SanDisk) 64GB).
4. In the upper right corner, tap three points (⋮) and select Storage Settings.
5. Choose internal memory (or format as internal memory).
6. Confirm action. The system will warn you that all data on the map will be deleted.
7. Wait until the process is complete (it can take up to 20 minutes) and after the reboot, the card will become part of the internal memory.

⚠️ Note: If the menu does not include Format as internal, your firmware does not support this function (ADB).

After combining in the Memory menu, you will see a single section where SD-However, some applications (such as WhatsApp) may still store data in internal memory – this is a limitation of Android, not WhatsApp. MIUI.

Method 2: ADB Combination (for all versions of MIUI)

If the settings do not have the option of formatting the card as internal, use ADB-This method works on any firmware, but it requires a computer.

Steps:

1. Get Redmi on board. 4X PC-only USB-cable (original or quality).
2. Open the command line (Windows) or the terminal (Linux/Mac) and type:

adb devices

If the device appears in the list, enter:

adb shell

Then check the ID. SD-map:

sm list-disks

You'll see something like this. disk:179,XX (where XX — Remember that number.

Now enter the command to format (replace XX with your drive number):

sm partition disk:179,XX private

After completing the command, restart the phone:

reboot

⚠️ Warning: If the card does not appear as internal memory after rebooting, repeat the process or check if the disk number is entered correctly!

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If you have a Command Not Found error after sm partition, upgrade to MIUI 10 or later. In older versions of Android (below 6.0), Adoptable Storage is not supported.

5 How to transfer applications to SD-post-community

Even after successful integration, not all applications are automatically saved to SD.

1. Open the Settings → Applications.
2. Select the app you want (such as Facebook or Gallery).
3. Press Warehouse.
4. If the option to Change is available, select it and specify it. SD-map.
5. Confirm the transfer. Some apps (like WhatsApp) don't support portability, that's a developer limitation.

For mass porting, use apps like AppMgr III (available on Google Play), which let you sort apps by size and port them in batches.

Possible errors and their solution

When combining memory on Redmi 4X, users often face the following problems:

• 🚫 SD-Card not defined: Check that the card is inserted in Slot 2 (if you use two) SIM). Also try to format it in the FAT32 computer.
• 🚫 The "Command Not Found" error in ADB: Update the firmware to MIUI 10+ or use an alternative method (e.g, TWRP).
• 🚫 Phone brakes after you combine: Wine is cheap or slow card. Replace it with a model class. A2 (For example, SanDisk Extreme).
• 🚫 Applications not installed: Free up space in internal memory (minimum 500MB). APK-Files temporarily require internal storage.

If after the combination the phone began to overheat or discharge quickly, this is a sign of a malfunction. SD-Remove it immediately (via Settings) → Memory. → Remove) and replace.

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After the merger SD-The card is slow, check it for errors using CrystalDiskMark (Windows) or SD Card Tester (Android) Read speed should be at least 10 MB/s, write - 5 MB/s.

7 How to cancel the merger and return SD-map

If you decide to divide the memory back, do the following:

1. Create a backup of important data with SD-maps (after cancellation of the merger it will be formatted).
2. Go to Settings. → Memory.
3. Press on. SD-map and select Format as portable (or Extract).
4. Confirm the action. The phone will reboot, and the card will become a normal removable drive.

⚠️ Attention: If you extract SD-card without canceling the combination, the phone can stop loading! in this case, you will need to reset via Recovery Mode (press the Power). + Volume Up when switched on).

Once the memory is shared, some applications installed on the SD may stop working. They will have to be reinstalled.

FAQ: Frequent questions about memory pooling on Redmi 4X