Xiaomi Redmi 8 is one of the most popular budget smartphones with support for memory expansion via microSD cards, but many users face problems when connecting first: the phone does not see the drive, does not allow you to move applications or requires formatting. In this article, we will discuss all ways of connecting SD-maps – from physical installation to system configuration, and also tell how to avoid errors and make the most of additional storage.
Feature Redmi 8 - hybrid slot for the SIM-cards where the second slot can be used or under the second SIM, Or microSD (up to 512 GB), which means that you can work with two different devices at the same time. SIM And you can't have a memory card. SIM, You'll have to choose between them and the expansion of memory, but let's take it from the choice of the card to the intricacies of how to use it.
1. What kind. SD-The cards are suitable for Xiaomi Redmi 8
Not all microSD cards work equally well with Redmi 8. The manufacturer officially supports microSDXC cards (up to 512 GB) with a speed class UHS-I (U1/U3) or Class 10.
- 🔹 Capacity: optimally 64-256 GB. 512 GB cards can run slower due to the limitations of the smartphone controller.
- 🔹 Speed: To record video in Full HD Class 10 is enough, but for 4K Frequent file transfer is better U3 (Minimum recording speed of 30 MB/s).
- 🔹 Brand: reliable maps from SanDisk, Samsung EVO It's called Kingston Canvas, and cheap no-name cards are often forged to indicate overcapacity.
Important: Redmi 8 does not support SD-ExFAT cards out of the box. If you buy a card that's over 32 GB, you'll have to format it into a card that's not a big deal. FAT32 (up to 32 GB or NTFS (More about this in the section on formatting.
2. Physical installation of the memory card
In Redmi 8 slots for SIM-The cards and the microSD are combined into a single tray (hybrid slot) to insert the memory card:
- Turn off your phone (optional, but recommended for safety).
- Find on the left end of the smartphone tray for SIM-Put the paper clip in a small hole to extract the tray.
- Put the microSD card in the slot SIM 2 (top slot) contacts down. Second slot (SIM (1) remains under the main SIM-map.
- Carefully insert the tray back before the click.
If the phone has been turned off, turn it on. In a few seconds, the notification will appear "New". SD-If no notification is available, check if the card is inserted correctly (contacts should be directed to the back of the phone).
Is the phone off (recommended)|
Is the map correctly oriented (contacts down)|
Any damage to the card's contacts |
The tray is inserted to the point and fixed-->
3. Formatting SD-card
If Redmi 8 doesn't see the card or suggests formatting it, that's fine -- especially for newer drives. Formatting erases all data, so if there are important files on the card, copy them to your computer first.
How to format SD-card right on the phone:
- Go to Settings. → Warehouse.
- Tap on point. SD-Card (or Portable Storage).
- In the upper right corner, press three dots (⋮) and select Storage Settings.
- Select Format → Format as internal storage (if you want to use a map for applications) or Format as portable (file only).
| Type of formatting | Advantages | Deficiencies |
|---|---|---|
| Like an internal storage facility. | You can transfer applications to the map | The card cannot be removed without data loss; it runs slower than the internal memory. |
| Like a portable storage facility. | You can retrieve the card at any time; compatible with other devices | Applications cannot be transferred to the map (files only) |
Important: If you choose formatting as internal storage, the card will be encrypted and unreadable on other devices (even after being retrieved), a process that is irreversible without completely erasing the data.
4. Transfer of data and applications to SD-map
Once formatted as an internal storage, you can transfer some applications and files to it, but not all programs support this functionality, especially system and some games (for example, PUBG Mobile or Genshin Impact).
How to move applications:
- Open Settings → Applications → All applications.
- Select the app you want (such as WhatsApp or Google Maps).
- Slip the vault. → Change. → SD-map.
- Confirm the transfer. The process may take a few minutes.
For file transfer (photos, videos, music) the easiest way to use File Manager (built-in or Mi File Manager):
- 📁 Open the folder with the files (for example, DCIM photo).
- 🔄 Select files, click Move and select SD-map.
- ⏳ Wait for the copy to be completed (speed depends on the card class).
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If the application is not transferred to SD-card, try to clear its cache (Settings) → Annexes → Warehouse → Clear cache. Sometimes this helps unlock the transfer option.
Typical problems and their solutions
Even after the correct installation SD-Redmi 8 cards can be affected by errors:
⚠️ Warning: If the phone is writing "SD-The card is corrupted, don't format it right away. Try connecting the card to your computer through a card reader and check for errors with the chkdsk (Windows) utility or Disk Utility (Mac: /f /r (Replace E: with the letter of your disk).
- 🚫 Phone doesn't see card: Check if the card is inserted correctly (contacts should be directed to the back cover). Reboot the phone. Try another card - maybe the problem is in the drive itself.
- ⚠️ The map is slow: If the card is formatted as internal storage, the read/write speed drops by 20 to 30 percent. This is normal. To speed up, only transfer heavy files (video, music) to the map, and leave the applications in internal memory.
- 🔄 Applications are not portable to the map: Some apps (such as Facebook or Instagram) block the transfer. Try using third-party utilities like AppMgr III (Root rights are required).
What if the card is no longer defined after the MIUI update?
6. Optimization of the use of SD-card
To make the memory card last longer and work stably, follow these tips:
- 📱 Do not remove the card while recording data (for example, when shooting a video or transferring files.
- 🔋 Make backup copies regularly. SD-Cards are less reliable than internal memory and can fail without warning.
- 🧹 Clear the cache of applications that actively use the card (for example, cameras or music players). → Warehouse → Clear the cache.
- 🛡️ Don’t store critical data (passwords, documents) on a map, and it’s better to use cloud services (Google Drive, Mi Cloud).
If you use the card as an internal storage device, keep an eye on the space available. When the memory runs out, the phone starts to slow down. The optimal way to leave 10 to 15 percent of the space available is to keep it open.
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For maximum speed of operation SD-maps 8 Use class cards U3 (UHS-I) capacity 256 GB: Larger or slower cards (Class) 4/6) They will be working with delays.
7.Alternative ways to expand memory
If for some reason you cannot use SD-card (for example, two cards are needed) SIM), consider other options:
- ☁️ Cloud storage: Google Photos (unlimited storage of compressed photos). Mi Cloud (5 GB free for Xiaomi owners), Yandex Drive or Mail.ru Cloud (10-100 GB free when registering).
- 🖥️ USB-OTG Drivers: Connect the flash drive through USB-OTG Adapter (Type-C port in Redmi 8 supports) OTG). The speed of the work will be higher than that of SD-cards, but the carrier is less portable.
- 🔄 Optimizing internal memory: Remove the app cache (Settings) → Warehouse → Cache data. Move media files to the cloud and delete local copies. Use Lite versions of apps (e.g. Facebook Lite or Messenger Lite).
If you often shoot videos in 4K Or play hard games, it's better not to rely on just the SD-The best option is a combination of internal memory (for applications) + Cloud storage (for photo/video) + SD-maps (for music and backups).