Xiaomi Redmi 8 is still a popular budget smartphone, but its internal memory (32 or 64 GB) quickly ends when used actively. The microSD card is an easy solution to expand storage, but not all models are perfect. In this article, we will analyze the technical requirements of Redmi 8 for drives, how to avoid counterfeiting and which brands are trustworthy in 2026.
It's important to consider not just volume, but also speed class, file system format and even manufacturer -- that's what makes the camera stable, 4K video recording speed and map durability -- we tested 15 models from different brands, selected the best price/quality options, and we also collected unique data on compatibility with MIUI 12-14 firmware.
Xiaomi Redmi 8 specifications for memory cards
The smartphone supports microSD format SDHC (up to 32 GB) and SDXC (up to 2 TB), but there are nuances:
- 🔹 Maximum volume: officially announced up to 512 GB, but in practice, 1 TB cards work (subject to updated firmware).
- 🔹 Speed class: minimum class 10 (UHS-I U1), videotape 4K@30fps need UHS-I U3 or V30.
- 🔹 File system: FAT32 (up to 32 GB or exFAT (64 GB). NTFS unsupported!
- 🔹 Slot: hybrid (combined with SIM2), Therefore, using two SIM-You will have to choose between the second SIM card and the memory card.
Note that Redmi 8 does not support UHS-II and newer standards — this is excessive for a budget smartphone. Also, some MIUI firmware may have errors when formatting cards with a volume of >256 GB — solved by software updates or manual formatting on a PC.
TOP-5 memory cards for Xiaomi Redmi 8 in 2026
We tested the cards on Redmi 8 with MIUI 14 firmware (Android 12) on the criteria: read/write speed, stability when recording 1080p/4K video, heating and compatibility with applications.
| Model | Volume. | Class speed | Speed (read/write) | Price (compared to market, 2026) | Features |
|---|---|---|---|---|---|
| SanDisk Ultra microSDXC | 128GB | UHS-I U1 (A1) | 120/40 MB/s | ~1 200 ₽ | Best choice for everyday tasks. Supports Adoptable Storage. |
| Samsung EVO Select | 256GB | UHS-I U3 (A2) | 130/90 MB/s | ~2 100 ₽ | Best for recording. 4K-Video, complete with adapter SD. |
| Kingston Canvas Go! Plus | 128GB | UHS-I U3 (V30) | 170/90 MB/s | ~1 500 ₽ | High speed recording, but warms up with a long load. |
| Lexar Play microSDXC | 256GB | UHS-I U3 (A2) | 150/70 MB/s | ~1 900 ₽ | A good alternative to Samsung. It's suitable for gamers. |
| Silicon Power Superior | 512GB | UHS-I U3 (V30) | 100/80 MB/s | ~3 500 ₽ | The maximum volume for the Redmi 8, but requires MIUI 13+ firmware. |
⚠️ Note: Transcend maps and ADATA Fakes are often faked – only buy from authorized dealers (for example, in brand stores on Wildberries or Ozon marked “100% original”). Counterfeit can be slow and fail in 3-6 months.
How to check your memory card for compatibility with Redmi 8
Even if the card meets the specifications, it can work unstable, and here's how to check it before you buy it or after you install it:
Make sure the speed class is not below UHS-I U1
Check for the SD Association logo (original guarantee)
Use the SD Card Formatter utility for exFAT formatting
Test speed with A1 SD Bench (should be >10 MB/s of recording)
Try to record a video. 1080p@60fps — If there are no lags, the map fits.-->
If you install the Redmi 8 card:
- 📱 Do not see it - check if it is inserted correctly (contacts upwards).
- 🐢 Brakes when recording video - speed class is too low.
- 🔄 Self-mounted – possibly a problem in the slot (need to be cleaned or changed).
⚠️ Note: Do not use memory cards as internal storage (Adoptable Storage function in the computer). MIUI). This speeds up the wear and tear of the drive and can lead to data loss when you retrieve the card, it is better to store photos, videos and music on it, and applications in internal memory.
What happens if you use an incompatible memory card?
If you ignore Redmi 8’s memory card requirements, the consequences can be serious:
- 🚫 Data loss: Class Class Cards 4/6 Fail to handle the data stream when recording video, which leads to file corruption.
- 🔥 Overheating: Cheap cards without temperature control can heat up to 60°C, which causes emergency shutdown of the camera.
- 🐌 System freezes: When using the card as internal memory (Adoptable Storage), low read/write speed slows down the smartphone.
- 💥 Slot failure: Poor quality cards with improper contact soldering can damage the microSD connector.
Details about the damage to the slot
It is especially dangerous to use cards without certification. SD Association – they may have a real volume less than the declared (for example, "128 GB will actually be 64 You can check this with a utility. H2testw (Windows or F3 (Linux/macOS).
How to properly install and configure a memory card
The installation process seems simple, but there are nuances that affect performance:
- Put the card in the slot SIM2/microSD (If you use two contacts upwards. SIM-cards, you will have to choose between the second SIM card and memory card.
- Formatting: 📱 Through Smartphone: Settings → Memory. → Memory map → Formatting as a portable device. 💻 Through PC: Use SD Card Formatter (select exFAT for cards) >32GB).
Data portability
- 📷 Photo/Video: Select files in the gallery → Move it to SD-map.
- 🎵 Music: in the Mi Music player, click Settings → Default folder and point the path to the map.
⚠️ Note: Do not remove the memory card while recording videos or transferring files - this may damage the file system.Always use the Safe Retrieval feature in the notification curtain.
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If the smartphone doesn't see the card after formatting, try turning it off in the settings (Memory → SD Card → Disable), then remove and paste it back in again. This will reset the mount cache.
Frequent errors in the selection and use of memory cards
Even experienced users make mistakes that shorten card life or impair Redmi 8 performance.
- 💾 Buying a card without a margin of volume: If you shoot a lot of videos in 4K, 64GB is only enough for 2-3 hours of recording. Take a minimum of 128GB.
- 🔄 Frequent formatting: Each formatting cycle reduces the life of memory cells.
- 🌡️ Use in extreme conditions: Memory cards are afraid of overheating (>50°C) and humidity: Do not leave your smartphone in the sun or in the bathroom.
- 📱 Storage of applications on SD-Even with Adoptable Storage, games and programs will slow down – the internal memory of the eMMC 5.1 in Redmi 8 is faster than any microSD.
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The most common mistake is to buy a card on the principle of "cheaper, better." ₽ It turns into lost photos or slot breakage. The optimal budget for a reliable 128 GB card is 1,200-1,800. ₽.
Another problem is file fragmentation, and over time, the read/write speeds drop because of the random placement of data.
- 📂 Regularly copy files to PC and format the map (every 3-6 months).
- 📱 Use a file manager (e.g., Mi File Manager) for defragmentation (available in firmware) MIUI 12+).
Alternatives to memory cards for Redmi 8
If the microSD slot is occupied by the second SIM-card or you don’t want to spend money on the drive, consider alternative ways to expand memory:
- ☁️ Cloud storage: Google Photos (free 15 GB, photo compression). Mi Cloud (5 GB free, integration with the Internet MIUI). Yandex Drive (10GB free, autoload photo).
- 🖥️ USB-OTG drives: plug-in flash drives USB-C (For example, SanDisk Ultra Dual Drive. SSD (demand OTG-cable and power from Power Bank).
- 📶 FTP-Server: Configure access to smartphone files over the local network through applications such as FX File Explorer.
However, these methods have disadvantages:
- ☁️ Clouds require stable internet and can slow down your camera when you boot.
- 🖥️ USB-port-holder USB-C, squash.
- 🔒 FTP-The server risks data security if it is set up incorrectly.
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The memory card remains the most reliable and versatile solution for Redmi 8 if you need to store large amounts of offline data (such as offline maps, movies or backups).