Xiaomi Redmi 7A, released in 2019, is still a popular budget device due to its reliability and simplicity. However, 16 or 32 GB of internal memory, depending on the modification, quickly run out — especially if you actively shoot videos, install games or store music offline. The solution is obvious: expand memory with a microSD card.
In this article, we will discuss in detail what specifications should be on a memory card for the Redmi 7A, what speed classes are supported, and give practical tips on selection and installation. You will learn why some microSDs are slow or not determined by the device, and how to avoid typical purchase errors.
Technical requirements for memory cards for Redmi 7A
Xiaomi manufacturer in the documentation for the Redmi 7A indicates the basic parameters of compatibility with memory cards. The main limitation is the maximum supported volume: officially announced up to 256 GB. However, in practice, users successfully use cards and larger size (up to 512 GB), but with reservations.
Key parameters:
- 📏 Form factor: microSD only (not miniSD or microSD) SD). Slots combined with SIM-card).
- 🔢 Maximum volume: up to 256 GB (officially), but it is possible to work with 512 GB with updated software.
- ⚡ Speed class: Minimum Class 4, Class recommended 10 or UHS-I (U1/U3) videotape.
- 🔄 File system: FAT32 (up to 32 GB or exFAT (64 GB).
Important: Redmi 7A supportive SDXC-cards (over 2 TB capacity), as the hardware platform of the smartphone is limited to the standard microSDHC (up to 32 GB) and microSDXC (up to 2 TB, but with software restrictions). NTFS.
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If you plan to record video in Full HD resolution, choose cards labeled U3 or V30 – they guarantee a minimum recording speed of 30 MB / s, which is critical for stable camera performance.
What speed classes are suitable for the Redmi 7A: understand the marking
The speed characteristics of the memory card directly affect the performance of the smartphone. For the Redmi 7A with its modest Qualcomm Snapdragon 439 processor and a single-core 13 MP camera, record speeds are not required, but there are nuances:
Speed classes are denoted by a digit in a circle (for example, Class 10) or by the letter U with a digit (U1, U3). For Redmi. 7A relevant recommendations:
- 📷 Photography: Class 4 or Class 6 is enough.
- 🎥 Video: Full HD (1080p): a minimum of Class 10 or U1.
- 🎮 Games and Applications: Preferably U3 or V30 speed up loading.
- 🚫 Not suitable: cards without markings or with a class below Class 4.
Marking Vxx (e.g., V30) indicates a minimum write speed in MB/s (here - 30 MB/s). For Redmi 7A this is redundant, but such maps of future stock speed.
| Marking | Minimum recording speed | Suitable for | Recommendation for Redmi 7A |
|---|---|---|---|
| Class 4 | 4 MB/s | Photos, music | ✅ Enough. |
| Class 10 | 10 MB/s | Full HD video video | ✅ Optimally. |
| UHS-I (U1) | 10 MB/s | Full HD, games | ✅ Recommended |
| UHS-I (U3) | 30 MB/s | 4K video, heavy games | ⚠️ Excessively but compatible |
| V30 | 30 MB/s | Professional photography | ⚠️ Unnecessarily expensive |
Top.-5 Memory cards for Xiaomi Redmi 7A: tested
There are hundreds of microSD models on the market, but not all of them work equally well with the Redmi 7A. We tested popular cards and selected those that show stable operation without hanging or errors.
The best options for price/quality ratio:
- 🥇 SanDisk Ultra microSDXC UHS-I (A1) — Best choice for most users: speed up to 100 MB/s, reliability, class A1 speed up applications.
- 🥈 Samsung EVO Plus microSDXC UHS-I (U3) — High speed (up to 130MB/s), suitable for recording video.
- 🥉 Kingston Canvas Go! Plus microSDXC (U3, V30) — Budget alternative with good speed indicators.
- 💰 Silicon Power Superior microSDXC (U1, A1) — low-cost A1 installing applications.
- 🔄 Transcend High Endurance microSDHC (U3, V30) — Specialized card for video recorders, but works well in smartphones.
⚠️ Warning: Avoid cards without speed class or suspiciously low price tags. SanDisk or Samsung fakes often have less than the actual volume claimed and fail after a few months.
A critical nuance: cards with a capacity of 400 GB or more may not be determined in the Redmi 7A due to the limitations of the MIUI 10/11 firmware. Upgrading to MIUI 12.5 solves the problem for most models.
How to install a memory card in Redmi 7A: step-by-step instructions
Installation of microSD in Redmi 7A requires care, since the slot is combined with a tray for SIM-To avoid damaging contacts or losing details, follow the instructions:
☑️ Preparation for installation of a memory card
Step-by-step process:
- Turn off the phone. Removing the tray when the device is on can damage the slot.
- Find the tray: it is located on the left side of the face (if you look at the screen).
- Remove the tray with a paper clip inserted into a small hole. Don't use needles or toothpicks!
- Install the card: If you use one SIM-Insert the microSD into the top slot (signed as microSD). SIM-You have to choose the cards, or the second. SIM, or a memory card (hybrid slot).
Put the tray back in.
Turn on the phone.
If the map is not determined:
- 🔄 Reboot your smartphone.
- 🛠️ Check if the card is inserted correctly (contacts down).
- 🗑️ Format the map in FAT32 or exFAT via computer or computer.
- 📱 Update the firmware to the latest version MIUI.
What to do if your smartphone is writing "SD-map damaged"
Memory card formatting: which file system to choose
The file system will determine whether the Redmi 7A can work correctly with the card.
- FAT32: Compatible with all devices, but limited to 32GB per file (not to be confused with card size!).
- exFAT: supports files up to 16 EB (virtually unlimited), and is optimal for cards up to 64 GB.
How to format the map correctly:
- Connect the card to the computer through the card reader.
- Open Disk Management (Windows) or Disk Utility (macOS).
- Select a map, press Format.
- Specify the file system: Up to 32 GB - FAT32. From 64 GB - exFAT.
4096 bytes
Start formatting and wait until it is completed.
⚠️ Attention: Do not use NTFS — Redmi 7A Do not support this file system for external drives, and avoid "fast formatting" on cards that were previously used in other devices (for example, cameras) - this can lead to read errors.
Once formatted, insert the card into your smartphone, and the system will suggest using it as portable storage (for files) or internal memory (for applications), and for most tasks, the first option is sufficient.
Frequent memory card issues in Redmi 7A and their solutions
Even compatible cards sometimes cause failures, and let's look at typical situations and how to fix them:
| Problem. | Possible cause | Decision |
|---|---|---|
| Map not determined | Incorrect formatting, damage to contacts | Reformat to exFAT, check the slot for garbage |
| Slow work | Low-speed card class | Replace by a Class 10 or U1 card |
| Applications are not installed on the map | The card is formatted as a portable storage | Reconfigure as internal memory in Settings → Storage |
| Suddenly's map becomes "empty" | File system failure | Connect to PC, check for errors (chkdsk in Windows) |
If the card stopped being detected after the smartphone fell, the problem could be mechanical damage to the slot.
- Try to gently blow the slot with compressed air (for example, a canister for cleaning equipment).
- Check the card on another device.
- If the slot is damaged, contact the service center. The replacement of the slot will cost 1000-1500 rubles.
How to set up:
- Put the card in your smartphone.
- When a notification appears, select Set up as internal storage.
- Follow the system instructions (formatting is required).
- After setting up, go to Settings → Applications and transfer the necessary programs to the map.
⚠️ Note: If you use the card as internal memory, back up your data regularly. If the card crashes (which is not uncommon for budget microSDs), you will lose not only files, but also some of the application settings.