How to transfer data to a memory card in Xiaomi Redmi 9: a complete guide with error solutions

Transferring data to a memory card in Xiaomi Redmi 9 is a challenge faced by every second owner of this smartphone. Despite 64 or 128 GB of internal memory, high-resolution photos, video 4K And modern games quickly clog up the internal drive, MIUI It offers several ways to free up space, from moving files to using the card as an internal storage (Adoptable Storage), but there are nuances: not all applications support portability, and the wrong formatting. SD-The cards can lead to data loss.

In this article, we’ll break down 5 proven methods for transferring data to a memory card in Redmi 9, including hidden features. MIUI, You'll learn how to avoid the memory card error, why some files aren't copied, and what to do if your smartphone can't see. SD-And then at the end, you get answers to some of the common questions that save you hours of forum search.

Preparation of a memory card: selection and formatting

Before transferring data, make sure your memory card is compatible with the Xiaomi Redmi 9. Officially, the device supports microSD up to 512 GB (FAT32 or exFAT format), but there are important limitations:

• 🔹 Speed class: minimum class 10 (UHS-I) videotape 4K. Class Cards 4/6 It will be slowed down when transferring large files.
• 🔹 File system: FAT32 Suitable for files up to 4 GB, exFAT – for files over 4 GB (e.g. drone video).
• 🔹 Brand: avoid no-name cards - they often fake volume.Best options: SanDisk Ultra, Samsung EVO, Kingston Canvas.

If the card is new, it should be formatted directly in the smartphone:

1. Insert the card into the tray (microSD + nano-SIM support in the hybrid slot).
2. Go to Settings → Memory → Memory Map.
3. Click Format and select Portable Storage (for normal use) or Internal Storage (for system memory expansion).

⚠️ Warning: Formatting as an "Adoptable Storage" will make the card tied to the device, and once retrieved, the data on it will not be available on other gadgets!

2. Standard transfer of files through the "Conductor"

The easiest way is to use the built-in MIUI File Manager, which allows you to move photos, videos, music and documents without any additional applications.

1. Open the Files app (the folder icon on the desktop).
2. Go to the Internal Memory section and select a folder (e.g. DCIM for photos or Download for downloads).
3. Press your finger on the file to select (or click "Select" in the upper right corner).
4. Click "Move" (arrow icon) and point the path to SD-map (e.g., map, /storage/XXXX-XXXX/DCIM/Camera).

To speed up the process, use the packet mode:

• 📁 Select a few files by holding your finger and swiping across the screen.
• 🔄 Press "Sort" → "Size" to first transfer the heaviest files.
• ⚡ Enable "Quick Copy" in the Explorer settings (Section "More" → "Settings").

⚠️ Note: If you have a “Not enough space” error when you transfer, check if the map is occupied by hidden files (for example, an application cache). → Memory. → Cleanup.

3. Transfer of applications to a memory card (with restrictions)

Unlike files, applications are transferred to SD-Redmi 9 is not always available, depending on the developer's policy and version. MIUI. Here's what you need to know:

• ✅ Supported: Most games (e.g. Genshin Impact, PUBG Mobile and some applications (e.g. Google Maps).
• ❌ Not supported: system applications (Mi Home, Security), instant messengers (WhatsApp, Telegram), banking applications.

Instructions for transfer:

1. Open Settings → Applications → Application Management.
2. Select the application you want (such as Spotify).
3. Click "Storage" → "Change" → "Memory Map".
4. Confirm the transfer. The process can take up to 5 minutes (depending on the size of the application).

Important: After transferring the application to SD-The card can run slower, especially if the Class 10 card is not supported. UHS-I. Tests show launch delay increases by 20 to 40%.

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Before you transfer the application, clear its cache to Settings → Apps → Storage → Clear the cache. This will reduce the amount of data you transfer.

4.Use of the card as internal memory (Adoptable Storage)

Adoptable Storage allows you to combine a memory card with internal storage, but in MIUI for Redmi 9, it works with limitations.

1. Insert the card and go to Settings → Memory → Memory Map.
2. Click "Three Dots" (menu) → "Storage settings" → "Format as internal."
3. Confirm action. The map will be formatted in ext4 (incompatible with other devices!).
4. After formatting, select “Move Data Now” or do it manually later.

Advantages and disadvantages of the method:

• ✅ Applications are installed on the card automatically (if there is a place).
• ✅ The system perceives the card as part of internal memory (for example, for updates). MIUI).
• ❌ The card becomes unreadable on PCs or other phones without formatting.
• ❌ Speed is lower than that of internal memory (especially noticeable in games).

⚠️ Warning: If you retrieve a card formatted as internal memory, Redmi 9 may start to slow down or reboot. Always use Safe Retrieval in the notification curtain!

5. Data transfer via PC (for large volumes)

If you need to move tens of gigabytes (like a movie collection or backup), you can use a computer more conveniently.

1. Connect Redmi 9 to your PC via USB-cable (file transfer mode) or MTP).
2. Open "This Computer" on Windows or "Finder" on Mac. The smartphone will appear as a removable drive.
3. Copy files from internal storage to an SD card.
4. To speed up, use an archiver (such as 7-Zip) to compress folders before transferring.

Tips for avoiding mistakes:

• 🔌 Use the original Xiaomi cable – cheap cables can cut the transmission.
• 🛡️ Disable the antivirus on your PC – it can block copying large files.
• ⏳ If the transfer is interrupted, try to transfer files in packs of 5-10 GB.

Mac users will need additional software as MTP is not supported by default. Install Android File Transfer (the official application from Google) or OpenMTP (an alternative for newer versions of macOS).

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Transfers via PC are 2-3 times faster than via Explorer on a smartphone, especially for files larger than 1GB.

6. Automatic transfer of photos and videos (camera setting)

To save new photos and videos to the memory card, change the camera settings:

1. Open the Camera app.
2. Touch the badge. ⚙️ ("Settings") → "Preservation site".
3. Select Memory Card (if the option is inactive, make sure the card is formatted and inserted correctly).

For photos already taken, use automatic backup:

• 📸 In Google Photos: Enable "Backup and Sync" and select "Original Quality" (files will be duplicated on the map).
• 🔄 In the Gallery. MIUI: Press "More" → "Settings" → "Autosave on the map".

Please note the limitations:

• 🚫 Video in the video 4K@30fps You may not be able to save to Class cards. 10 without UHS-I (The error is "Insufficient recording speed").
• 📱 Photo format RAW (If enabled in the camera settings, it takes up to 30MB each – make sure there is enough space on the map.

7. Solving common mistakes

When transferring data to a memory card in Redmi 9, users often encounter errors, and here are the most common ways to fix them:

If the card is no longer defined after the MIUI update, try:

1. Restart your phone in Safe Mode (hold the power button → “Safe Mode”).
2. Clear the Storage app cache (Settings → Apps → All Apps → Storage → Clear the cache).
3. Reset network settings (Settings) → SIM-maps and mobile networks → Resetting network settings).

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If they start to fly out after transferring applications to the map, return them back to internal memory, which is a sign of incompatibility with exFAT or slow card.

FAQ: Answers to Frequent Questions