Full Memory Card Check in Xiaomi Phone: From Errors to Reading Speed

The memory card in Xiaomi smartphone is not just an additional storage for photos and videos, but a critical component on which the stability of the device depends. An improperly functioning microSD can cause freezes, data loss or even a complete system failure. But how do you know that the problem is in the drive, and not in the phone?

We will look at all the available verification methods – from standard tools to standard ones. MIUI You'll learn how to test read/write speeds, check the drive for file system errors, and even detect forgery. FAQ Answering the most frequent questions from Xiaomi users.

Important: Before you start your diagnosis, make sure your memory card is compatible with the smartphone model. For example, flagships Xiaomi 13 Ultra or Redmi Note 12 Pro+ support UFS 3.1 and microSDXC up to 1TB, while budget models like Poco M5 Can only work with microSDHC up to 512GB.

Preliminary preparation: what to do before the inspection

Before you start testing, follow a few mandatory steps that will help you avoid false positives and save your data.

• 📱 Backup. Move all important files from your memory card to the cloud (Mi Cloud, Google Drive) or your computer. Use a wired connection to speed up the process.
• 🔋 Charge your phone. Diagnosis can take up to 30 minutes, and battery drain during the check will cause a failure.
• 🛠️ Clean the contacts. Take a soft, lilaless cloth soaked in isopropyl alcohol, and gently wipe the card and slot contacts on your phone. Dust or oxidation often causes false errors.
• 🔄 Reboot the device. This will reset the temporary caches and closed processes that may have affected the drive.

If your Xiaomi doesn’t recognize the memory card at all, check:

• 🔌 Is the scaling up the scaling up (and down the scaling) right).
• 📏 Is the format compatible: FAT32 (up to 32 GB), exFAT (64 GB-2 TB) or NTFS (rarely maintained).
• 🔧 Is there any physical damage on the map (cracks, chips, bent contacts).

⚠️ Note: If the memory card was retrieved during the recording of data (for example, when shooting a video) 4K), This could cause damage to the file system, so don't format it right away, try to restore it with Recuva or DiskDigger first.

2. Standard verification through settings MIUI

MIUI It has built-in tools for basic diagnostics of drives, which are not a substitute for full-fledged testing, but will help to identify obvious problems.

To run the check:

1. Open the Settings → Memory.
2. Tap on the name of your memory card (for example, SD-128GB card).
3. Select Check and Correct (in some versions) MIUI This item may be called Diagnostics).
4. Confirm the start of the process. The phone will scan the drive for file system errors.

If the system finds a problem, it will suggest that you fix it, and you agree that it's safe and it won't delete your data.

• ⏳ The check can take from 5 to 20 minutes depending on the size of the card.
• 📵 Do not remove the drive during the process and do not interrupt the process.
• 🔄 If errors reappear after correction, this is a sign of physical wear and tear on the card.

⚠️ Attention: In some firmware MIUI (Especially with older models like Redmi. 4X) The memory card verification function may not be available, in which case use the methods in the following sections.

3. Checking for errors through the computer (Windows/macOS)

If embedded tools MIUI If you don't give the full picture, you plug the memory card into your computer, and you can use more powerful diagnostic tools.

First, remove the card from your phone and paste it into the card reader (better to use it). USB 3.0 for accurate speed measurements:

For Windows:

1. Open this computer (My computer in older versions).
2. Right-click on the memory card disk → Properties → service.
3. Press the Check-out. → Check and repair damaged sectors.
4. Wait until completion (may take up to an hour for 256 cards)+ GB).

For macOS:

1. Open the Disk Utility (Applications → Utilities)
2. Select your card from the left menu.
3. Press First Aid. → Launch.
4. If the utility finds errors, it will offer to correct them.

For deep diagnosis, we recommend using specialized programs:

• 🛠️ H2testw (Windows - checks the real size of the map and identifies "broken" sectors.
• 📊 CrystalDiskMark – Tests the read/write speed (see section 4 for more details).
• 🔍 SD Card Formatter (from) SD Association – correctly formats the cards, restoring their factory settings.

Use the original card reader (not cheap Chinese)

Disable "Quick Deletion" in Disk Properties (for Windows)

Check the map for viruses with Malwarebytes

Do not remove the card during the check-->

If programs detect errors that cannot be fixed, it's a sign of physical wear and tear on the card.

1. Copy all available data.
2. Format the map in exFAT with the help of SD Card Formatter.
3. If errors remain, replace the storage device.

4. Testing of reading and writing speed

Slow memory card can cause lags when shooting video in 4K, You can use benchmark tools to check the actual speed.

On the phone Xiaomi can use the application A1 SD Bench (available on Google Play) It's testing:

• 📥 Sequential Reading Speed (Important for Video Viewing).
• 📤 Sequential recording speed (critical for video shooting).
• 🔄 Random read/write speed (affects app performance).

Normal indicators for cards of different classes:

If your card shows a speed below the stated one, the reasons may be as follows:

• 🔌 Low-quality card reader – use the original adapter from SanDisk or Samsung.
• 📱 Phone Limitations – Xiaomi’s budget models (e.g. Redmi) 9A) They may not be able to maintain high speeds due to a weak memory controller.
• 🗑️ Fragmentation of data – format the map regularly (every 3-6 months).

💡

If the recording speed is below 10 MB/s, do not use the card to shoot video in the resolution above. 720p — This will lead to "teared" video and missed footage.

For accurate testing on PC, use CrystalDiskMark:

1. Install the program from the official website.
2. Select the letter of the disk of your memory card.
3. Run the test with settings: 5 passes, 1 GiB.
4. Compare the results with the passport data of the card (indicated on the package).

5. How to identify a fake or "stripped" memory card

The market is flooded with fake cards that pose as branded cards (like SanDisk Extreme) but have much smaller real volume, and there are several ways to recognize the fraud.

Signs of forgery:

• 🏷️ The price is much lower than the market (for example, 512 GB for 1000 rubles).
• 📦 Absence of a hologram or unreadable serial number on the package.
• 🖥️ In the properties of the card, one volume is displayed, and when writing files, another.

To check the actual volume:

1. Download the utility. H2testw (reference).
2. Select your memory card.
3. Press Write + Verify and wait for the test to be completed.
4. If the program shows Warning: Only X of Y GByte tested where X is less than Y, your card is fake.

Critical: Fake cards are often formatted into FAT32 So, for example, instead of 128 GB, you get 16 GB, but the system shows the full volume until you try to write more data on it than it can hold.

Additional tests:

• 🔍 Check the serial number of the card on the manufacturer's website: SanDisk: Samsung warranty verification: validation
• 📡 Use the app. SD Insight (Android) to see real map data, including CID (unique identifier).

⚠️ Warning: If you find a fake, stop using it immediately, not only does it lose data, but it can also physically damage the microSD slot on the phone due to unstable voltage.

6. Check the compatibility of the card with the Xiaomi model

Not all memory cards work equally well with Xiaomi phones, such as flagships like the Xiaomi 13 Pro. UFS 4.0 and can "brake" with cheap microSDHC, whereas low-end models (Poco) M4 Pro) will not see cards larger than 512 GB.

Xiaomi’s official model restrictions:

How to check compatibility:

1. Put the card in the phone.
2. Go to Settings. → Memory. → SD-map.
3. If the Format button is internal active, the card is compatible.
4. If the phone offers to format the card in FAT32 volumewise >32GB is a sign of incompatibility.

For models with MIUI 13+ Adoptable Storage is available, but it has some nuances:

• 🔒 The card is tied to the phone and will not be read on other devices.
• ⚡ The speed of applications from the card will be lower than with the built-in memory.
• 🔄 When resetting the phone to the factory settings, the map will have to be formatted again.

💡

If your Xiaomi doesn’t see a memory card larger than 32 GB, format it in exFAT on PC. FAT32 Does not support file size >4 GB and has a partition size limit.

Diagnosis of physical injuries

If the memory card is detected by the system but is not running smoothly (e.g., it disappears while shooting a video or crashes out of the system), physical defects may be the cause.

Signs of physical wear:

• 🔥 The phone gets very hot when working with the card.
• 📵 The map periodically "falls off" and appears again.
• ⚡ When connecting to the PC, a message appears Device USB unrecognized.
• 💥 On the map appear "broken" files (for example, photos with artifacts).

To check the card for physical damage:

1. Visual inspection: Light the contacts with a flashlight - they should be smooth, without oxidation. Check the case for cracks (especially if the card fell).
2. Heat test: Connect the card to your phone and start recording video in 4K 10-15 minutes if the card case is hot (more than 50 minutes)°C) is a sign of wear of the controller.
3. Controller Verification: Use FlashID (for Windows) to find out the controller model. If the controller is unknown or displayed as Generic, there is a high probability of forgery.

If the card has physical damage:

• 🚫 Do not use it to store important data.
• 🔧 Try to recover data with R-Studio (paid) or TestDisk (free).
• ♻️ Remove the card - it is not subject to repair.

⚠️ Note: If your Xiaomi has stopped seeing any memory cards, the problem may be in the microSD slot.In this case, try to clean the contacts with alcohol or contact the service center.

FAQ: Frequent questions about memory cards in Xiaomi