Why Selecting a Memory Card for the Redmi Note 8 Pro Is Not as Easy as It Looks
Xiaomi Redmi Note 8 Pro is still a popular choice among users who value balance of price and performance, but even with 64 or 128 GB of internal memory, the issue of expanding storage sooner or later arises, and then the difficulties begin: the market is littered with memory cards, but not all of them will be suitable for this model.
The main problem is that it doesn't work with some standards, like the Redmi Note 8 Pro supports microSDXC up to 512GB, but only with certain speed classes, and if you pick a card that doesn't work, you run the risk of running into brakes when you're recording 4K video, slow app loading, or even reading errors, and in this article, we'll look at how to avoid typical errors and find the best option.
We analyzed Xiaomi’s official guidelines, user reviews, and test results to compile a checklist of criteria, which speed classes are really important, why a brand matters, and how not to overpay for unnecessary features, and at the end, we’ll have an FAQ that answers the most common questions.
1. Compatibility: Which memory cards does the Redmi Note 8 Pro support?
The first thing to check is the physical format and maximum volume. Redmi Note 8 Pro is equipped with a hybrid microSD slot. + Nano-SIM means you can use either of these. SIM-card SIM + Memory card, officially maintained:
- 📱 MicroSD format only (not miniSD or microSD) SD adapter-wise!)
- 💾 Types: microSDHC (up to 32 GB) and microSDXC (up to 512 GB)
- ⚡ File system: FAT32 (up to 32 GB or exFAT (64 GB)
Important: Some users report problems with 256GB cards or more — the smartphone can see them, but there may be errors when writing large files, due to the limitations of MIUI firmware. If you need this volume, choose cards with guaranteed compatibility (more on this below).
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Before buying a 256/512 GB card, check the MIUI version: old builds (below 12.5) may have bugs with exFAT. Update the firmware through Settings → About Phone → System Update
| Characteristics | Minimum requirement | Recommended parameter |
|---|---|---|
| Form factor | microSD | microSDXC (for volumes >32 GB) |
| Max. Volume. | Up to 512GB | 128–256 GB (optimal for price/volume) |
| Class speed | Class 10 or UHS-I U1 | UHS-I U3 or A2 (for applications) |
| File system | FAT32/exFAT | exFAT (for cards >64 GB) |
2.Write and Read Speed: What Really Matters
Many users mistakenly believe that the faster the card speed, the better.In fact, for the Redmi Note 8 Pro, there are critical thresholds that do not make sense to exceed – a smartphone simply will not be able to use them.
The smartphone supports the UHS-I standard, but the maximum write speed is limited by the memory controller at the level of ~80-90 MB / s. This means that the card with the declared 170 MB / s will work no faster than the model at 90 MB / s.
- 🎥 For the video. 4K: minimum UHS-I U3 (30MB/s of recording. Maps U1 Class 10 may not be able to handle the video, it will be broken".
- 📱 For applications: class A2 (minimum of 4,000 IOPS This will speed up the launch of games and programs from the map.
- 📷 For photos: even Class 10 is enough, but for serial shooting in the RAW better U1 or U3.
⚠️ Note: Redmi Note 8 Pro has a card bug UHS-II — They are defined as UHS-I, But they don't work in a stable way. Avoid these models, even if they're cheaper.
3.Size of the card: how much memory is really needed
The size of the volume depends on your tasks. Here are some guidelines:
- 📸 32-64 GB: enough for 5-10 thousand photos or 500-1000 songs, it will work if you do not shoot videos and install heavy games.
- 🎮 128GB: optimal for most. hosts 20–30 games (like Call of Duty Mobile or Genshin Impact) + photo/video for the year.
- 🎬 256GB: You need to shoot a lot of video in the video 4K or store offline maps (for example, for Google Maps or Yandex.Navigator).
- 💾 512GB: overpriced for a smartphone, often forged and unreasonably high.
Tip: If you choose between 128 GB and 256 GB, you'd better take two 128 GB cards from trusted brands, which is cheaper and more reliable than one 256 GB from a little-known manufacturer.
How to check the actual size of the card after purchase?
4.Brands: Who can be trusted and who can be avoided
The memory card market is flooded with counterfeits, especially at online stores like AliExpress or Wildberries, and we tested 15 models and identified reliable manufacturers.
| Brand | Pluses | Cons | Recommended model |
|---|---|---|---|
| SanDisk | High speed, reliability, 10 years warranty | More expensive than analogues | SanDisk Ultra microSDXC UHS-I U1 A1 |
| Samsung | Optimal price/quality ratio, good compatibility | Sometimes they get broken parties. | Samsung EVO Select UHS-I U3 A2 |
| Kingston | Budgetary option, rarely forged | Speed below declared | Kingston Canvas Go! Plus UHS-I U3 A2 |
| Silicon Power | Cheap, often discounted | Low durability (few recording cycles) | Silicon Power Superior Pro UHS-I U3 A1 |
❌ What brands to avoid:
- 🚫 NoName (without logo) – 90% of fakes.
- 🚫 Transcend (models below) U3) — slow down.
- 🚫 Patriot – many complaints about compatibility with Xiaomi.
⚠️ Note: Buy memory cards only from official dealers (for example, SanDisk on Ozon or SberMegaMarket marked "Original"). On AliExpress, even in official brands stores, counterfeits are often sold.
5. How to properly insert and configure a memory card
Even the most expensive card can work poorly if it is not installed or configured correctly.
- Turn off your smartphone (required!).
- Insert the card into the microSD slot (located on the left side next to the SIM slot).
- Turn on the phone and wait for the card to be identified.
- Go to Settings → Storage → Memory Map.
- Choose Format as internal memory (if you want to install applications) or as portable device (file only).
☑️ Preparation of the memory card for use
Important: If you choose formatting as internal memory, the card cannot be retrieved without losing data. Also, some applications (such as WhatsApp or Telegram) may not be transferred to the card automatically - they need to be moved manually through Settings → Apps → [Title] → Storage.
Typical problems and their solutions
Even with the right card, you can get errors, and here are the most common ways to fix them:
- 🔄 The card is not determined: Check if the card is inserted correctly (contacts should be on top). Reboot your smartphone. Try formatting the card on your PC in the computer. FAT32 exFAT.
- 🐢 Slow work: Make sure the card matches the class U3 or A2. Move the app cache back to internal memory. Check the card for errors through Settings → Warehouse → Memory map → Verification.
- ❌ Recording errors: Update firmware MIUI Try another card, which may be damaged, and turn off Adaptive Brightness (sometimes it conflicts with the card's performance).
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If the card is no longer defined after the MIUI update, reset the storage settings via Settings → Additional → Reset → Reset the storage settings. This will not delete files, but will return the standard microSD settings.
7.Memory card alternatives: when to consider other options
Memory cards are not the only way to expand storage, but in some cases, alternatives may be more convenient:
- ☁️ Cloud storage: 🔹 Google Drive (15GB free). 🔹 Yandex.Disk (10 GB free, +10GB for card binding). 🔹 Mi Cloud (5GB free, integrated with MIUI). Plus: access from any device.
- 🖥️ External SSD/HDD: Connect through OTG-Adapter (e.g., Xiaomi Type-C to) USB). Suitable for movie or backup storage, plus: large volume (up to) 2 TB. Minus: It's uncomfortable to carry around.
- 📡 FTP-Server on PC: Configure access to files on your computer through ES Explorer or Solid Explorer. Plus: no card to buy. Minus: only works on one Wi-Fi network.
A memory card remains the best option for offline storage (photos, videos, offline cards), but if you need to sync files between devices, consider clouds or external drives.