How to properly use an SD card on Xiaomi smartphones: from formatting to transferring data

Smartphones Xiaomi known for their price-to-functionality ratio, but even the most productive models often suffer from a lack of built-in memory. An SD card becomes a lifesaver for users who want to store more photos, videos or install heavy applications. However, simply inserting a memory card into the slot is not enough - you need to configure it correctly to avoid errors and make the most of the additional space.

In this article we will look at all the nuances of working with SD cards on Xiaomi: from choosing the appropriate media to the intricacies of formatting and transferring data. We will pay special attention to models with hybrid slots (for example, Redmi Note 10 Pro or POCO X3 Pro), where a memory card can replace a second SIM card. We will also look at why some applications cannot be transferred to SD and how to get around this limitation.

How to choose an SD card for Xiaomi: speed, capacity and compatibility

Not every memory card is suitable for your smartphone. Performance and stability depend on the speed class, file system type, and even brand. For example, cheap microSD without class markings can slow down when recording video in 4K or launching applications.

For modern smartphones Xiaomi (2020 and newer) cards are recommended UHS-I class U3 or A2. They provide a minimum recording speed 30 MB/s, which is critical for recording video and working with applications. It is better to choose a volume from 64 GB - this is enough for 10-15 thousand photos or 50-100 heavy games. The maximum supported volume depends on the model:

• 📱 Redmi 9/10 series, POCO M3/M4: up to 512 GB (officially), but the cards are more stable up to 256 GB.
• 📱 Xiaomi 11/12/13 episodes, POCO F3/4: up to 1 TB, but require formatting in exFAT.
• 📱 Old models (Redmi 5/6, Mi A2): maximum 256 GB, only FAT32.

Please note brand: cards SanDisk Extreme, Samsung EVO Plus or Kingston Canvas Go! show better compatibility with firmware MIUI. Avoid no-name media - they often fake the speed class and can damage data.

Preparing an SD card: formatting and selecting a file system

Before using the memory card for the first time it is necessary to format via a smartphone. This will delete all data and configure the file system as required Android. In Xiaomi there are three formatting options available:

1. Portable storage (FAT32/exFAT) - the card is used as a flash drive for files (photos, videos, music). Applications cannot be transferred to it.
2. Internal memory (ext4- the card becomes part of the system, you can transfer applications. After formatting, the card cannot be read on a PC without special apps.
3. Hybrid mode (not available on all models) - part of the memory is allocated for applications, part for files.

To format the card:

1. Insert the card into the slot (with the phone turned off, if the slot is hybrid).
2. Go to Settings → Storage → SD card.
3. Select Format as internal memory (for applications) or Portable storage (for files).
4. Confirm the action - the process will take 1-5 minutes.

Insert the card into the slot (with the phone turned off, if it is a hybrid)

Check free space in Settings → Storage

Select formatting type (internal memory or portable)

Confirm formatting and wait for completion

Reboot your smartphone after formatting-->

⚠️ Attention: If you format the card as internal memory, MIUI may offer to transfer some of the data to it automatically. Refuse this offer - it is better to do the transfer manually to avoid errors.

Format type	File system	Transferring applications	PC compatibility	Max. file size
Portable storage	FAT32 or exFAT	❌ No	✅ Yes	4 GB (FAT32) / 16 EB (exFAT)
Internal memory	ext4	✅ Yes	❌ No (requires root)	Unlimited
Hybrid mode	ext4 + exFAT	✅ Partially	⚠️ Only the section with files	Depends on the section

Transferring applications to an SD card: what is possible and what is not

Even after formatting the card as internal memory, not all applications are possible transfer. This depends on the developer's policy and version Android. For example, WhatsApp, Telegram and most banking applications do not support transfer due to security requirements.

To transfer supported applications:

1. Open Settings → Applications → Manage applications.
2. Select the desired application (for example, Spotify or Google Maps).
3. Click Storage → Edit → SD card.
4. Confirm the transfer and wait for completion (may take up to 10 minutes).

If the button Change is inactive, then the application does not support the transfer. In this case, you can:

• 🔄 Use function Clear cache manually to free up space in the internal memory.
• 📁 Transfer only application media files (for example, downloads from Chrome or music from VK Music transferring an application to an SD card, check its rating on Google Play. If it has less than 4 stars and there are many complaints about crashes, it is better to leave it in the internal memory - working with SD can worsen stability. VK Music).
• 🛠️ Install Lite versions applications (for example, Facebook Lite or Messenger Lite).

⚠️ Attention: Transferring applications to a class SD card U1 or Class 10 (without markings A1/A2) can lead to freezes. For stable operation, you need a card marked A2 (optimized for applications).

Storage optimization: how to automatically save files to an SD card

So as not to fill up the internal memory, you can set up automatic saving of photos, videos and downloads to the SD card. MIUI this is done separately for each type of file:

• 📸 Photos and videos: Open the application Camera → Settings (⚙️) → Save location → SD card.
• 🎵 Music and podcasts: In applications Music or Google Podcasts select the folder on SD in the download settings.
• 📥 Files from the browser: In Chrome or MIUI Browser go to Settings → Downloads → Saving location.
• 📩 Attachments from messengers: In Telegram or Viber you can specify the SD card as the location for saving media in Settings → Data and memory.

For convenience, create folders on the SD card with clear names:

SD card/
├── Photo/
├── Video/
├── Music/
├── Downloads/
└── Documents/

This will make it easier to find files and prevent chaos in the root directory. We also recommend that you enable the display of hidden files in any file manager (for example, in MI File Manager) in order to see the service folders of applications (for example, .thumbdata for thumbnails).

What happens if you remove the SD card without a safe shutdown?

If you suddenly remove the card during When recording files (for example, when shooting videos or transferring applications), file system errors may occur. At best, the latest data will be lost; at worst, the card will become unreadable and will require formatting. Always use the function Safely remove in the notification shade or storage settings.

Problem solving: the SD card is not detected or works slowly

If the smartphone does not see the SD card or it is unstable, the reasons may be either hardware or software. Let's start with simple solutions:

1. Reboot: Turn off the phone, remove the card, insert it again and turn on the device.
2. Cleaning contacts: If the slot is a hybrid, wipe the contacts of the card and slot with a dry cloth (no alcohol!).
3. Check on a PC: Connect the card to the computer via a card reader. If it is not detected, the problem is in the card itself.

If the card is detected, but works slowly:

• 🐢 Check the speed class: cards Class 4 or U1 are not suitable for recording 4K-video.
• 🔄 Format the card to exFAT (if it is FAT32) - this will eliminate the file size limit of 4 GB.
• 📉 Close background applications that may be using the card (for example, Google Photos during synchronization).

To diagnose the speed of the card, use applications like A1 SD Bench (available in Google Play). Normal indicators for UHS-I U3:

• 📈 Reading: 80–95 MB/s.
• 📉 Writing: 20–40 MB/s (for A2 - from 40 MB/s).

⚠️ Attention: If, after formatting the card as internal memory, the smartphone starts to slow down, return it to portable storage mode. Some models Xiaomi (for example, Redmi 7 or Mi 9 Lite) are poorly optimized to work with ext4 slow cards.

Data security: encryption and backup

SD cards are vulnerable to data loss - they can be easily damaged or lost. protect information:

• 🔒 Encryption: You can set a password. Please note that after this the card cannot be read on other devices without decryption. Settings → Security → Encryption SD cards you can set a password. Please note that after this the card cannot be read on other devices without decryption.
• 💾 Backups: Regularly copy important files to your PC or to the cloud (Google Drive, Mi Cloud). To automatically back up photos, use Google Photo (settings → Backup and synchronization).
• 🛡️ Check for viruses: Install Dr.Web Light or Malwarebytes and periodically scan the card.

If you store confidential data (scans of documents, passwords) on an SD card, it is better to use encrypted container. Applications like Cryptomator or ES File Explorer (function Encrypted folderare suitable for this). after entering the password.

⚠️ Attention: SD card encryption in MIUI may conflict with some custom firmware (for example, LineageOS). If you plan to reflash the phone, first decrypt the card or make a backup.

Features of working with SD cards on different models. Xiaomi

Firmware MIUI behaves differently on different devices. For example, on flagships (Xiaomi 13 Pro, POCO F5) it is supported exFAT for cards up to 1 TB, and on budget models (Redmi A1, POCO C50) there may be a limit of 256 GB.

The operation of hybrid slots is also different:

• 📶 On Redmi Note 11 Pro+ and newer slot supports 5G and microSD at the same time (if the second SIM is 4G).
• 📵 On POCO X3 NFC when using an SD card, the second SIM is completely disabled.
• 🔄 On Mi 10T i Mi 11 Lite you can switch the priority between the second SIM and SD card in Settings → SIM cards and mobile networks.

On some models (for example, Redmi 9A) there is no option to format the SD card as internal memory. In this case, all that remains is to use it to store files or install Lite versions applications.

The storage settings interface may also differ. For example, on MIUI 14 path. to format the card: Settings → Storage → Advanced (⋮) → Storage settings → SD card. On older versions (MIUI 12), this section may be called Memory and located in the main settings menu.

FAQ: Frequently asked questions about working with SD cards on Xiaomi

Can an SD card be used as internal memory on all Xiaomi models?

No, not on all. Budget models (for example, Redmi 8A, POCO C31and some smartphones with MIUI for Android Go do not support this mode. Also, the function can be disabled in regional firmware (for example, for China Check availability). options in Settings → Storage → SD card.

Why did it become slower after formatting the SD card as internal memory?

This is due to the fact that the file system ext4 adds overhead for encryption and logging. In addition, many cards of the U1 or Class 10 class are not physically designed to work with small files (like applications). data-i="298">How to transfer WhatsApp to an SD card? A2 (For example, SanDisk Extreme A2).

How to transfer WhatsApp to SD card?

Officially WhatsApp does not support transfer to an SD card due to security requirements. However, you can transfer media files (photos, videos, voice messages) manually:

1. Open WhatsApp → ⋮ → Settings → Data and storage → Storage management.
2. Select a large chat and click Export chat (without media).
3. Copy the folder WhatsApp/Media from the internal memory to the SD card manually (via MI File Manager).
4. Delete the original files to free up space.

⚠️ With this transfer, new media files will be saved to the internal memory until you transfer them manually again.

Is it possible to play games from an SD card on Xiaomi?

Technically yes, but with caveats:

• 🎮 Games with high requirements (Genshin Impact, Call of Duty Mobile) will slow down, if the card is slower UHS-I U3.
• 📱 Some games (for example, PUBG Mobile) block launching from the SD card due to anti-cheats.
• 🔄 The best option is to store only light games on the card (for example, Among Us, Brawl Stars) or a cache of heavy games (via Settings → Storage → Cleaning).

What to do if Xiaomi writes "SD card is damaged"?

This the error occurs when the file system fails. Try the following steps:

1. Connect the card to the PC and run the scan via Properties → Tools → Check (Windows) or Disk Utility (Mac).
2. If this does not help, format the card v FAT32 via PC (use SD Formatter from SD Association).
3. If the card is not formatted, it is physically damaged - replace it.

⚠️ Do not use the card after errors appear - this may lead to the loss of all data.