The Xiaomi Redmi Note 5 is still one of the brand’s most popular budget smartphones, despite the launch of new models, and its key advantage is the ability to expand memory using a microSD card, but not all users know how to choose the right drive.
In this article, we will analyze all the technical nuances: from maximum volume and speed classes to compatibility with formats. FAT32/exFAT. You will also learn which memory card brands work best with Redmi Note. 5, How to avoid counterfeiting and what to do if the smartphone does not see the drive. MIUI card-volume 256 GB – this information is often hidden even in official sources.
Technical characteristics of the microSD slot in Redmi Note 5
Xiaomi Redmi Note 5 (codenamed whyred) is equipped with a hybrid slot for microSD memory cards (also known as TransFlash). SIM-card or memory card, both options are not available at the same time:
- 📏 Physical format: MicroSD only (not compatible with miniSD or SD adapter).
- 🔢 Maximum volume: up to 256 GB (officially), but there are nuances with firmware (more on this below).
- ⚡ Speed classes: Class 10, UHS-I (U1/U3), A1/A2 (application).
- 🔄 Modes of operation: as a portable storage (FAT32/exFAT) Or as an internal memory (Adoptable Storage) in Android).
Important: The slot does not support microSDXC of 512 GB or higher, even if the card has a class. UHS-I. This is a limitation in the memory controller of the smartphone, and when you try to use these cards, you will get an error "SD-Card damaged" or "Not supported".
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If you plan to record 4K video on the Redmi Note 5, choose cards with a speed class U3 or V30 – they guarantee the minimum recording speed of 30 MB / s, necessary for stable operation.
Maximum memory card size: myths and reality
Xiaomi’s official specifications indicate support for cards up to 256 GB, but in practice it all depends on the version of the MIUI firmware:
| MIUI version | Max, the volume of microSD | Adoptable Storage Support | Notes |
|---|---|---|---|
| MIUI 9–10 (Android 7–8) | 256GB | ❌ No. | Cards >128GB require formatting in exFAT. |
| MIUI 11–12 (Android 9–10) | 256GB | ✅ Yes (with limitations) | Adoptable Storage is unstable on cards > 128 GB. |
| MIUI 12.5+ (Android 11) | 256 GB* | ✅ Yes. | *Some users report working with 512GB after manual patching of vold.fstab. |
Critical limitation: on firmware older than MIUI 12.5, cards with a capacity of 512 GB or more can be defined as 256 GB due to a bug in the controller driver. This is not a hardware problem – it can be avoided by editing system files (requires root), but there is no guarantee of stable operation.
If you need a card that is more than 256GB, consider alternatives:
- 🔄 Use it. OTG-drive-storage USB-C).
- ☁️ Move some files to the cloud (Google Drive, Mi Cloud).
- 📱 Buy a smartphone with a large built-in drive (for example, Redmi Note) 10 Pro 128/256 GB).
Speed classes: what do you mean and which one to choose?
The memory cards contain different speed classes that define the minimum guaranteed write speed. The following standards apply to the Redmi Note 5:
- 🏷️ Class 10: Minimum recording speed – 10 MB/s. Suitable for music, photos, video Full HD.
- 🔥 UHS-I (U1/U3): U1: 10 MB/s (analogue of Class) 10). U3: 30 MB/s – mandatory for video 4K or slow-motion.
- 🤖 A1/A2: Optimized for applications (accidental access). A2 faster (4000 IOPS against 1500 IOPS bal A1).
Selection recommendations:
- 📷 For photo and video Full HD: Class 10 is sufficient or U1.
- 🎥 For 4K-video or games: only U3 + A2.
- 📱 Adoptable Storage (Map as internal memory): required A1/A2.
⚠️ Attention: Cheap cards with labels U3 Check test results on sites like CamSpeedTest or AnandTech before buying.
How to check the real speed of the card?
Top.-5 Memory cards for Redmi Note 5: tested
Based on user tests and expert reviews, we have compiled a list of reliable maps that are optimal for the Redmi Note 5:
| Model | Volume. | Class speed | Price (exemplary) | Notes |
|---|---|---|---|---|
| SanDisk Ultra A1 | 128GB | A1, U1 | ~1 500 ₽ | Better price/quality balance. Apps. |
| Samsung EVO Plus | 256GB | A2, U3 | ~3 000 ₽ | High speed random recording (ideal for gaming). |
| Kingston Canvas Go! Plus | 128GB | A2, U3 | ~1 800 ₽ | It's temperature-resistant. |
| Lexar Professional 1800x | 128GB | U3, V60 | ~2 500 ₽ | For professional video shooting. |
| Silicon Power Superior Pro | 64GB | A1, U1 | ~900 ₽ | Budget option for music and photos. |
⚠️ Warning: Avoid nameless brand cards (e.g. NoName or Transcend) that are often forged and have a real volume of 2-4 times less than the stated. Buy only from official distributors (Svyaznoy, M. Video, Amazon).
Before buying, check the card for authenticity with the help of the utility H2testw (Windows or F3 (Linux/macOS). These programs check the real volume and speed.
How to Install and Format a Memory Card
The process of installing the map in Redmi Note 5 is simple, but there are nuances with formatting.
Turn off your smartphone.|Remove the tray for SIM-paper-card|Place the microSD in the slot (contacts down)|Put the tray back before the click|Turn on the phone and wait for the card to be identified.-->
Once installed, the system will suggest formatting the map. Choose one of the options:
- 📁 Portable storage: the card will be used as a removable disk (FAT32 You can transfer files to your PC without any problems.
- 📱 Adoptable Storage: The card will be part of the system. ext4). Applications can be installed on it, but the map cannot be removed without data loss.
⚠️ Note: If you select Adoptable Storage and then retrieve the card, Redmi Note 5 It may stop downloading or lose application data.We recommend this mode only for maps. A1/A2 volume 64 GB.
For manual formatting:
- Go to Settings → Storage → SD card.
- Click Format → Internal Memory (or Portable Storage).
- Confirm the action. It takes 1-5 minutes depending on the volume.
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If the card is not defined, try formatting it on a PC in FAT32 (for cards up to 32 GB) or exFAT (for cards 64 GB or more) using the SD Formatter utility.
Frequent mistakes and their solutions
Redmi Note 5 users often face problems with memory cards, and consider common errors and ways to fix them:
| Mistake. | Reason. | Decision |
|---|---|---|
| "SD-map damaged" | Incorrect file system or physical damage. | Format the map on your PC in FAT32/exFAT. |
| "Read-only map" | A protected mode or a breakdown of the controller is activated. | Check the Lock switch on the adapter. If it's not there, the card is faulty. |
| Map not determined | Poor contact, incompatibility or firmware failure. | Try another card. If the problem persists, reflash your smartphone. |
| Slow work | Class 4 card or fake. | Replace the U3/A2 card. Run a speed test. |
If the card is no longer defined after the MIUI update, try:
- Reset the settings to factory (Settings → About phone → Reset settings).
- Reverse to the previous version of the firmware through Fastboot.
- Clear the /data partition cache via TWRP (requires an unlocked bootloader).
⚠️ Warning: If after formatting the card as internal memory (Adoptable Storage) the smartphone began to slow down, return it to portable storage mode:
- Go to Settings → Storage → SD card.
- Click Data Transfer and Formatting → Portable Storage.
- Wait until the process is completed (it can take up to 30 minutes).
How to transfer applications to a memory card
By default, Redmi Note 5 installs applications in internal memory, so to free up space, you can transfer some programs to microSD, but with the reservations:
- ✅ Can we move it: 📱 Most user applications (WhatsApp, Telegram, games). 🎵 Music, photos, videos (via file manager).
- ❌ Can't move it: 🔒 System applications (Settings, Phone, Google Play). 🛡️ Applications with administrator rights. 🎮 Anticheat games (PUBG Mobile, Call of Duty).
Instructions for transfer:
- Open the Settings → Applications.
- Select the appropriate app (such as Facebook).
- Click Warehouse → Change → SD Card.
- Confirm the transfer. The process may take a few minutes.
⚠️ Note: After transferring an application to a microSD card, it may run slower, especially if a Class 10 card is unsupported. A1. Also, some applications (for example, Netflix) do not allow you to download content to removable media.
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To speed up portable applications, use an A2 card (such as the Samsung EVO Plus) that is optimized for random access, which is critical for multitasking.