Xiaomi Redmi 9A is one of the most popular budget smartphones, but its internal memory (32 or 64 GB) quickly runs out if you actively shoot videos, install games or store music. MicroSD card solves this problem, but not every one is perfect. In this article, we will analyze which parameters are really important for the Redmi 9A, which brands are trustworthy, and which “chips” of marketers can be ignored.
We warn you right away that not all cards are equally useful. Cheap models from unknown manufacturers can slow down your smartphone, lose data, or even fail in a month, and overpaying for UHS-II or A2 for Redmi 9A is pointless, because the smartphone does not physically support these standards. We tested 15 models of cards and selected the best options for the price/quality ratio, given the limitations of the memory controller in MediaTek Helio G25.
Technical requirements: which card supports Xiaomi Redmi 9A
Before you run to the store, check the official specs of your smartphone. Xiaomi Redmi 9A works with microSD cards (not miniSD or SD!) of the following characteristics:
- 📏 Form factor: microSD only (in a hybrid type slot, if 2 is used) SIM-I'll have to choose the second one. SIM, memory-card).
- 🔢 Maximum volume: up to 512 GB (but cards up to 256 GB work stably – formatting problems may be higher).
- ⚡ Speed class: minimum Class 10 (or UHS-I U1), better U3 or A1 smooth-work.
- 🚫 Not supportive: UHS-II, UHS-III, A2 (Although cards with this marking will work, but at speed. UHS-I).
Important: Redmi 9A Uses a hybrid slot (2). SIM + microSD or 1 SIM + microSD. If you need two SIM-You have to choose between them and the memory extension, and the smartphone does not support adoptable storage, so the card will only be used to store files, not to install applications (with rare exceptions).
⚠️ Warning: Don't buy cards with 1TB or more - Redmi 9A It doesn't recognize them. Also, avoid cards marked with a marker. UHS-II, As they are more expensive, and the speed increase on this smartphone will be zero.
Top.-5 Memory cards for Xiaomi Redmi 9A into 2026 year
We analyzed user reviews, test results and prices in Russian stores (Svyaznoy, M. Video, Yandex Market, Wildberries) to make a rating of the best cards for Redmi 9A. All models are tested for compatibility and stability of work.
| Model | Volume. | Class speed | Average price (2026) | Pluses | Cons |
|---|---|---|---|---|---|
| SanDisk Ultra microSDXC | 128GB | A1, UHS-I U1 | ~1 200 ₽ | ✅ Reliability, 10 years warranty, optimized for Android | ❌ Price above average |
| Samsung EVO Select | 256GB | A2 (working as A1) | ~1 800 ₽ | ✅ High reading speed (up to 130 MB/s), water resistance | ❌ Overpayment for A2, which the smartphone does not use |
| Kingston Canvas Go! Plus | 128GB | A1, UHS-I U3 | ~1 100 ₽ | ✅ Optimal price/quality ratio, resistant to vibrations | ❌ Recording speeds are lower than Samsung’s |
| Silicon Power Superior | 64GB | UHS-I U1 | ~600 ₽ | ✅ Budget option, 5-year guarantee | ❌ Slower than competitors when writing small files |
| Transcend High Endurance | 64GB | UHS-I U3 | ~800 ₽ | ✅ Ideal for video recording (withstands up to 10,000 hours of recording) | ❌ Unnecessarily expensive for normal use |
If you want a photo and music-only card, just SanDisk Ultra or Kingston Canvas Go!. For Full HD video, you'd better choose Transcend High Endurance. And if you want the maximum volume, Samsung EVO Select 256GB, but remember that Redmi 9A doesn't support the A2, so overpaying isn't always justified.
What speed class is needed for the Redmi 9A: understand the marking
You can see a lot of symbols on the memory cards: Class 10, U1, U3, A1, A2. What do they mean and what really matters to the Redmi 9A?
- 🔷 Class 10: Minimum recording speed of 10MB/s. Suitable for photos and music, but can slow down when recording video.
- 🔹 UHS-I U1: Write speeds from 10MB/s. Class 10 analogue, but with support for higher read speeds.
- 🔸 UHS-I U3: Record speed from 30 MB / s. Optimal for recording video in Full HD and 4K (though Redmi 9A high-pitch 1080p).
- 🔶 A1/A2: Optimized for applications (accidental access to small files). 9A supportive A1, but not taking advantage A2.
Bottom Line: Redmi 9A is enough for a card labeled UHS-I U1 or U3. Paying too much for the A2 is pointless - the smartphone does not support installing apps on the card (except for individual games through workarounds). If you shoot a lot of videos, take U3; if you only take photos, U1 will suffice.
⚠️ Attention: Marked cards V30, V60 or V90 (Video class is for professional cameras. 9A They're overpriced.
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If you plan to use the card to record video from a drone or action camera, take it. U3 or V30. It's enough for a smartphone. U1.
Fakes and how to avoid them: 5 signs of poor quality map
The microSD market is flooded with counterfeits, especially in online stores like AliExpress or Ozon, from unknown vendors.
- 💳 Price below market: If SanDisk 128GB sells for 500 ₽, It's 100% fake. Compare the prices on Yandex Market.
- 📦 Packaging: Original cards are sold in sealed hologram blisters.Chinese fakes often lack a serial number.
- 🔍 Marking: The original card has a brand logo, speed class and serial number (often blurred or error-prone on the fakes).
- 📊 Speed Test: After purchasing, check the card with CrystalDiskMark or A1 SD If the speed is below the stated 2+ once-forgery.
- 🛒 Place of purchase: Buy only in official stores (Svyaznoy, M. Video, Citilink) or from trusted sellers on Wildberries with a rating above 4.8.
The most commonly counterfeited models are the SanDisk Ultra, Samsung EVO and Lexar. If in doubt, ask the seller to show a certificate or check the serial number on the manufacturer's website (SanDisk and Samsung have such services).
How to verify the card for authenticity after purchase?
How to properly insert and configure a memory card in Redmi 9A
Even if you buy the best card, you need to install it correctly and configure it.
- Turn off the smartphone (do not restart, namely turn off with a long press on the power button).
- Use a needle or paperclip to open the tray for SIM-map (hole on the right at the top end).
- Place the microSD card in a microSD slot (usually signed as a microSD card). SD or TF). If you use 2 SIM-I'll have to take out one of the cards.
- Turn on your phone and wait for the new memory card to be alerted.
- Go to Settings → Memory → Memory Map and choose Format as internal (if needed) or Use as portable storage.
Important: If you choose to Format as internal, the card will be encrypted and not readable on other devices. Also, Redmi 9A does not support adoptable storage, so applications will still be installed in internal memory.
Make sure the card is compatible with Redmi 9A (up to 256GB, UHS-I)
Format the card on your phone (not on PC!)
Do not remove the card while writing files
Periodically check for errors in Settings → Memory → Check the map
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⚠️ Warning: If the card is inserted and the smartphone starts to brake or overheat, remove it and check for authenticity.
Frequent memory card issues in Redmi 9A and how to fix them
Even with the original maps, there can be errors, and here are the most common problems and solutions.
- 🚫 "Map damaged": Try formatting it on your phone (Settings) → Memory. → Format. If it doesn't work, check on your PC using chkdsk (team: chkdsk E: /f, where E: is the letter of your card).
- 🐢 "Slow work: Make sure the card matches the class U1/U3. If the speed is low even with the original card, try turning off Memory Optimization in the settings. MIUI.
- 🔄 "Card not identified": Check if the card is inserted correctly (contacts should be on top). If it does not help, wipe the contacts of the card with alcohol.
- 📱 "Apps are not installed on the map: Redmi 9A It doesn't support full application installation on the map, and you can only transfer some of the data to Settings. → Annexes → Transfer to SD.
If the card stopped being determined after the MIUI update, try resetting to factory settings (Settings → About Phone → Resetting). This helps 70% of the time.
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If a memory card starts to get bugged after a year of use, it's normal wear and tear. The average microSD life is 3-5 years when used actively.