How to find out the volume and free space of the flash drive on Xiaomi: the complete guide

Putting microSD into Xiaomi Redmi, POCO or Mi, but you're not sure if it's the right size, or you want to check how much space you have left on your memory card after you write files? In this article, we'll look at all the ways you can go from standard MIUI tools to professional utilities that will show not only free space, but also the speed of the drive.

It’s important to understand that Xiaomi smartphones sometimes misrepresent flash drive data due to file system features (e.g. exFAT on cards over 32GB) or problems with slot contacts. We’ll tell you how to avoid typical errors and what to do if the phone doesn’t see part of the memory, and how to distinguish the original card from a fake card with an understated real volume.

1. Check the memory of the flash drive through the MIUI settings

The fastest way is to use the built-in system tools, which is suitable for all Xiaomi models, starting with MIUI 10 and later (including HyperOS).

1. Open the Settings app** (cog icon).
2. Go to the About Phone section. → Warehouse.
3. Scroll down to the memory card block** (or SD-map).

Here you will see two key figures:

• 📊 Total volume – the real capacity of the flash drive (for example, 128 GB).
• 📉 Free space – how much is left for new files.
• 🔄 System files – occupied by service data (cache, hidden folders).

If the Memory Map section is missing, this means that:

• ❌ The flash drive is not inserted or recognized.
• ❌ The card is formatted in an incompatible file system (e.g, NTFS).
• ❌ The settings include “Disable Memory Card”** (see Section 3).

💡

If the storage section displays less than the stated volume (for example, 58 GB instead of 64 GB), this is normal: manufacturers specify capacity in the decimal system (1 GB = 1,000,000 bytes), and the system in the binary (1 GB = 1,073,741,824 bytes).

2.Using Xiaomi File Manager

MIUI has a regular Files icon that shows detailed information about the drives, a method that is convenient if you not only need to check the volume, but also quickly clear unnecessary files.

Instructions:

1. Launch the Files app** (or File Manager on global firmware).

In this section you will see:

• 📁 Diagram of occupied space by category (photos, videos, documents).
• 🔍 The “Clean” button to delete unnecessary files.
• ⚙️ Card settings (formatting, extracting).

Warning: If you have connected the flash drive as “Internal Storage”** (an option on the first connection), the system may not show it separately in the file manager, in which case the card data is combined with the main memory of the phone.

3. Third-party applications for memory analysis

If standard MIUI tools don't seem informative enough, use specialized utilities that not only show the size of the flash drive, but also analyze its health, read/write speed, and detect fakes.

Top.-3 apps:

Example of the A1 SD Bench:

1. Install and open the application.
2. Select your flash drive in the list of drives.
3. Click Start Random Write + Read Test.
4. Wait for the test to be completed (it will take 1-5 minutes).

Results that should be paid attention to:

• 🔢 Total Storage – real volume (must match the declared volume).
• ⚡ Write/Read Speed – speed of writing/reading (for the purpose of reading) UHS-I norm: 10–90 MB/s).
• ⚠️ Warning: Fake Card! – Signal of counterfeit (volume understated).

Checking through a computer (for accurate diagnosis)

If you want to check your flash drive as accurately as possible (for example, before buying or if you suspect a fake), connect it to a PC, which will allow you to use professional utilities like H2testw or CrystalDiskMark.

Step-by-step:

1. Remove the card from Xiaomi and paste it into the PC card reader.

Critical: if H2testw shows Warning: Only 15.9 GByte OK error on a 32GB card, it is 100% fake. The real volume of such a flash drive is less than 16GB, and the rest of the space is “clogged” with junk data.

For the CrystalDiskMark speed test:

• Select the number of passes: 5.
• Specify the file size: 1000 MiB.
• Run the test with the All button.

⚠️ Warning: If the recording speed is lower 5 MB/s on a class map UHS-I (U1/U3), This is a sign of wear and tear or defect, and it's not recommended to use this flash drive to record video in a video. 4K installing applications.

5. ADB commands for advanced users

If you're familiar with ADB (Android Debug Bridge), you can get your flash drive data through the command line, which is useful for diagnosing mounting or file system problems.

Instructions:

1. Install ADB Tools on your PC.
2. Enable USB Debugging** on Xiaomi (Settings → About Phone → MIUI Version → 7 times click to activate Developer Mode, then Additional → Developers → Debugging over USB).

adb shell


sm list-volumes

Find the line with the sdcard or external_sd. For example:

private:179,64 mount_point=/mnt/media_rw/1234-5678 description=SD Card

To find out the free space, use:

df -h /mnt/media_rw/1234-5678

Where 1234-5678 is your flash drive’s unique identifier (it will be different in your case).

The result will be similar to:

Filesystem      Size  Used Avail Use% Mounted on


/dev/block/vold/179:65




119G   12G  107G  10% /mnt/media_rw/1234-5678

Here:

• Size is the total volume.
• Used is occupied space.
• Avail is a vacant seat.

💡

The sm list-volumes command shows all connected drives, including internal memory and storage. OTG-If your card is not listed, the problem is with the hardware (slots, contacts) or drivers. MIUI.

Frequent problems and their solutions

Sometimes the flash drive is not correctly defined by Xiaomi: it shows a smaller volume, does not format or disappears after a reboot, let's look at typical cases and how to fix them.

Problem 1: The flash drive shows less volume than claimed

Causes and solutions:

• 🛠️ Fake card - check in on the H2testw or A1 SD Bench.
• 🗃️ File system FAT32 — Limits file size to 4 GB. Solution: format in exFAT (via PC).
• 🔧 Hidden System Files – Use DiskInfo for Analysis.

Problem 2: The phone doesn't see the flash drive

Checklist for diagnosis:

Make sure the card is inserted before clicking|Reboot the phone|Check the flash drive on another device|Clean the slot contacts with alcohol|Update MIUI last-minute-->

Problem 3: The memory card is permanently disabled

Possible causes:

• 🛠️ Wear of contacts - inspect the slot for damage.

⚠️ Note: if after formatting the flash drive on the PC (in) NTFS) It’s not going to be Xiaomi, that’s okay — MIUI supportive NTFS without root. Use exFAT or FAT32.

FAQ: Frequent questions about flash drives on Xiaomi