The Xiaomi Redmi Note 8, released in 2019, is still a popular budget smartphone due to its balanced features and the possibility of expanding memory. However, many users face confusion: which memory cards are compatible with this model? On the Internet, you can find conflicting information – from claims of support for 2 TB to the limits of 256 GB. In this article, we will analyze the official specifications, tests of real users and hidden nuances that affect the operation of the microSD in the Redmi Note 8.
It's important to understand that card support is not just about the hardware of your smartphone, but also about the MIUI version, regional firmware and even the drive manufacturer. We've analyzed data from Xiaomi's technical documentation, feedback on the 4PDA and XDA-Developers forums, and we've run our own tests with cards from different brands. If you're planning to buy a microSD for your Redmi Note 8, this article will help you avoid errors and choose the best option.
Official Specifications: What Does Xiaomi Say?
According to the specifications published on the official website of Xiaomi, Redmi Note 8 supports microSD memory cards (including microSDHC and microSDXC) with a maximum volume of up to 256 GB.
- 📌 Type of slot: hybrid (combined with) SIM-You can use either two nano-SIMs or one nano-SIM. + microSD.
- 🔄 Formatting: the smartphone supports the exFAT file system for cards with a volume of more than 32 GB, which is critical for proper operation.
- ⚡ Speed: Officially announced support UHS-I (up to 104 MB/s), but the real speed depends on the firmware and the card model.
Interesting fact: in some regional versions of the Redmi Note 8 (for example, for India), the documentation indicates a maximum volume of 512 GB. This is due to the fact that the manufacturer tested firmware with extended support, but in mass models the limit remained at the level of 256 GB. We tested this in practice - 512 GB cards (for example, SanDisk Ultra) are determined, but work unstable: there are possible hangs when writing large files.
Real Tests: Which Cards Work in Practice?
To get a sense of real compatibility, we tested the Redmi Note 8 (MIUI 14.0.5) with different manufacturers and sizes of memory cards, and the results are shown in the table below. Note that all cards were formatted in exFAT before testing.
| Model map | Volume. | Class speed | Does it work? | Notes |
|---|---|---|---|---|
| SanDisk Ultra | 32GB | Class 10, U1 | ✅ Yes. | Stable work, reading speed ~80 MB/s |
| Samsung EVO Plus | 128GB | Class 10, U3 | ✅ Yes. | Maximum recording speed - 90 MB / s |
| Kingston Canvas Go! | 256GB | Class 10, U3, A2 | ✅ Yes. | The first connection requires a reboot. |
| Lexar Professional | 512GB | Class 10, U3, V30 | ⚠️ Partially. | Defined, but there may be errors when writing files >4 GB |
| Transcend High Endurance | 64GB | Class 10, U3, V30 | ✅ Yes. | Perfect for recording 4K video |
The tests show that cards up to 256 GB work without problems, but with 512 GB, it gets complicated, due to the limitations of the memory controller in the Redmi Note 8, which is optimized for the SDXC standard to 256 GB. It is also worth noting that cards with support for Application Performance Class 2 (A2) show the best speed when starting applications from an external drive.
⚠️ Note: If you use a memory card as internal storage (Adoptable Storage in Android), then once formatted, it cannot be removed without data loss. MIUI, but it is unstable - there are possible lags when writing files.
File System and Formats: What You Need to Know
The Redmi Note 8 supports three main memory card formats:
- MicroSD (up to 2 GB, FAT16) is an outdated format, not recommended for use.
- microSDHC (4-32 GB, FAT32) – Compatible but limited to file size (maximum 4 GB).
- microSDXC (64 GB-2 TB, exFAT) is the best choice for modern applications.
Key point: if you plan to burn files larger than 4GB to a card (such as 4K video or disk images), then you should definitely use exFAT. Otherwise, the smartphone simply will not be able to save such a file. To check the current file system of the card, go to Settings → Storage → Memory Map.
How to format a map in exFAT on Redmi Note 8?
Another nuance: some cheap memory cards (especially unnamed brands) can have fake specs, such as 128 GB on the case and 32 GB in real volume. You can check this with applications like SD Insight or A1 SD Bench, which show real-world storage settings.
Memory Card Speed: What Does Class Affect?
The performance of the memory card directly affects:
- ⏱️ Video recording speed (especially in the 4K@30fps full HD@60fps).
- 🎮 Running applications from an external drive (if the card is used as internal memory).
- 📁 Transferring large files (such as backups or images to the RAW).
In Redmi Note 8, the best choice will be cards with a speed class not lower than UHS-I U3 (minimum write speed of 30 MB / s).
- 🐢 Class 10 (10 MB/s) – suitable for music and photos, but will slow down when recording video.
- 🏃 UHS-I U1 (10MB/s – similar to Class 10, but with support for higher reading speeds.
- ⚡ UHS-I U3 (30 MB/s – recommended minimum for Full video HD and 4K.
- 🚀 V30/V60/V90 — Professional high-resolution video cards (supported but redundant for smartphones).
We tested the video recording in 4K@30fps on maps of different classes:
- SanDisk Ultra U1 (Class 10): Video is recorded, but artifacts are possible when moving fast.
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If you often shoot videos on the Redmi Note 8, choose an A2 (Application Performance Class 2) card that is optimized for simultaneous read/write, which reduces lags when multitasking.
How to check the compatibility of the memory card?
Before buying a memory card for Redmi Note 8, we recommend that you follow several steps to avoid problems:
View the official list of supported maps on the Xiaomi website (Specifications section for Redmi Note 8)
Check out reviews about a specific map model on forums (4PDA, XDA)
Make sure the card is SD Association certified (the package must have an SD logo)
Test the card on another device before using it in a smartphone
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If the card is already purchased, but the smartphone does not see it, follow the following steps:
- Reboot the Redmi Note 8 with the card inserted.
- Check if the card is inserted correctly (contacts should be facing upwards).
- Format the map on your PC in exFAT and try again.
- Update your MIUI firmware to the latest version (new versions fix microSD-enabled bugs).
If the card is detected but is not running smoothly (e.g., disappears after a reboot), it may be due to:
- 🔋 Insufficient controller power (try using a card without a case that can press the slot).
- 🛠️ Damaged contacts in the slot (clean them with a soft brush).
- 🤖 Firmware conflict (try resetting to factory settings).
⚠️ Note: If you use a memory card as internal storage (Adoptable Storage), after it is removed, some applications may stop working.
Top.-5 Memory cards for Xiaomi Redmi Note 8 into 2026 year
Based on tests and user feedback, we have compiled a rating of the best memory cards for the Redmi Note 8, taking into account the price/quality ratio and compatibility:
- Samsung EVO Plus 128GB (U3, A2) 🔹 Pros: high speed (up to 100 MB / s), reliability, optimized for Android. 🔹 Cons: above-average price. 🔹 Price: ~1 500–1 800 ₽.
When choosing a card, pay attention to the warranty - at official dealers it is at least 2-5 years. Avoid shopping on marketplaces from unverified sellers, as the risk of running into a fake is very high.
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For most Redmi Note users 8 The best choice will be the map size 128 GB U3/A2 — This is enough to store photos, videos and some applications, while the price remains reasonable.
Frequent problems and their solutions
Even with compatible memory cards, Redmi Note 8 users sometimes encounter errors, and consider the most common problems and ways to fix them:
1.The smartphone doesn't see the memory card
Possible causes:
- 🔌 The card is inserted incorrectly or the slot is contaminated.
- 🖥️ The map is formatted in NTFS (not supported by Android).
- 🛠️ The file system of the card is damaged.
Decision:
- Remove and re-insert the map.
- Format it on your PC in exFAT.
- Check the card on another device.
2.The map is determined, but the files are not copied
Possible causes:
- 📁 File system FAT32 (file-limitation >4GB).
- 🔋 Inadequate nutrition, especially when used USB-OTG).
- 🐞 Firmware error MIUI.
Solution: Reformat the card to exFAT or update the firmware.
3.The map is running slowly
Possible causes:
- 🐢 Low-class card (for example, Class 4).
- 🗑️ Fragmentation of files (relevant to frequently used cards).
- 📱 Energy saving settings limit productivity.
Solution: Replace the card with a U3/A2 model or format it.
If none of these methods helped, there may be a problem with the hardware of the smartphone (damaged card slot), in which case we recommend contacting the service center.