Where to look for a flash drive on Xiaomi Mi 9: from conductor to engineering menu

Lost files on the connected flash drive or Xiaomi Mi 9 just can not see USB-The problem is familiar to many users — a smartphone may not notice external memory due to failures in settings, physical damage to the adapter or firmware features. In this article, we will discuss all possible ways to detect a flash drive, from basic checks to hidden functions. MIUI, which are rarely mentioned in the standard instructions.

The Mi 9 feature is that there is no microSD card slot, so the flash drives only connect via a USB-OTG adapter. This adds to the complexity: if the adapter is faulty or the smartphone does not support NTFS/exFAT file systems, the drive will remain invisible. We tested the solutions on MIUI 12-14 firmware and identified 5 working methods, including bypassing restrictions through ADB.

Before you go into complex manipulations, make sure that the problem is not in the drive itself. Try connecting the flash drive to another device (computer, TV) - if it is not detected there, it is a hardware malfunction. If on the Mi 9 the flash drive was visible before, but Suddenly disappeared, the settings or software are to blame.

1. Checking connection through standard conductor

The most obvious way is to use an integrated file manager. MIUI. However, many users miss the nuances: for example, the flash drive can be displayed not in the root directory, but in the Devices or Devices section. USB-accumulator.

Open the Files app (the folder icon on your desktop) and follow the steps:

1. If the flash drive is displayed in gray, try reconnecting the adapter or pressing Update (round arrow in the upper right corner).

⚠️ Attention: MIUI 14 in some regional firmware section USB-The drive is hidden by default. To return it, go to Settings. → Annexes → Application management, find Files, clear cache and data.

If the flash drive doesn’t show up, check the notifications in the curtain: sometimes the Mi 9 will give a message «USB-It's connected, tap it to set up," but it disappears quickly. Flick the curtain down, maybe there's a window hidden with the choice of connection mode (File transfer, Charging, etc.).

Whether section is open "USB-accumulator"?

Has the data been updated (update button)?

Is there a connection notification in the curtain?

Has reconnection been tried? OTG-adapter?

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2. USB settings and connection modes

Xiaomi Mi 9 may not see the flash drive due to the incorrect USB mode. By default, the smartphone often sets Charge Only mode, blocking access to data. To change this:

Connect the flash drive through OTG-adapter and perform:

1. Turn the notification curtain down.
2. Find the USB File Transfer Notice (or similar one) and if it isn’t, check if the connect indicator on the adapter is on.
3. Tap on the notification and select "File Transfer» (MTP). Alternative regimes: 📁 PTP — Photo transfer (sometimes works with flash drives). 🔌 MIDI — not suitable for storage. ⚡ Charging only – blocks access to data.

On the firmware MIUI 13+ regime MTP It can be reset after rebooting. To fix this, turn off the Optimization function. USB» Developer: Go to Settings → The phone. → Version. MIUI (tap 7 times to activate the developer mode, then to Settings → Additionally. → For developers and disable the option “Optimization” USB-configuration».

⚠️ Warning: If the flash drive doesn't show up after the change of mode, check the cable and adapter. OTG-adapters often do not provide enough current to power the drive. Try an externally powered adapter (for example, USB-charging-stack).

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If the flash drive is defined as "Unknown Device," try connecting it directly to your computer via a USB-C-USB-A cable, and if you can't see it there, it's the drive itself, not the smartphone.

3. Checking the compatibility of file systems

The Xiaomi Mi 9 officially supports FAT32 and exFAT file systems, but NTFS often has problems. If your flash drive is formatted in NTFS, your smartphone may not recognize it or suggest formatting it.

To find out the file system:

1. Connect the flash drive to your computer (Windows/macOS).
2. Open “This Computer” (Windows) or “Disk Utility” (macOS).
3. Look at the properties of the drive - there will be a type of file system.

⚠️ Attention: Formatting will destroy all the data on the flash drive! If it has important files on it, copy them to the computer first. FAT32 For flash drives larger than 32 GB, it does not support files sized >4GB.

4.Diagnostics through Engineering Menu and ADB

If standard methods don’t work, you’ll have to use hidden tools. MIUI. One of them is an engineering menu that shows all the connected devices. USB-devices, including unidentified.

To open the engineering menu:

If the flash drive is defined in the engineering menu, but not visible in the conductor, the problem is in the drivers. MIUI. Solution - resetting settings USB:

adb shell settings put global usb_mass_storage_enabled 1

This command must be entered through ADB (instruction below).

To work with ADB:

1. Connect Mi 9 to your PC via USB, turn on “Debugging by USB” (Settings → About Phone → MIUI Version → 7 taps → For developers → Debugging by USB).

5. Power problems and hardware malfunctions

A common cause of the flash drive's "disappearance" is insufficient power. Xiaomi Mi 9 doesn't always provide enough current for the drive to run. USB-scalables, especially if:

Decisions:

• 🔌 Connect. OTG-externally powered hub (for example, via a splitter with a charging port).
• 🔋 Charge your smartphone to 50% and reconnect.
• 🔄 Try another one. OTG-Adapter (preferably original from Xiaomi or a proven brand).

⚠️ Note: If the flash drive is only detected when connected to charging, it is a sign of a malfunction of the power controller in the adapter or the drive itself. In this case, we recommend replacing the flash drive - further use may lead to data loss.

Also check the USB-C port on your smartphone: often after falls or prolonged use, contacts become contaminated. Clean the port with a soft toothpick (not metal!) and blow with compressed air. If contacts are damaged, repairs will be required at the service center.

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If the flash drive works only with external power, the problem is insufficient current from the OTG-It's not a smartphone defect, it's a feature. USB-specifications for mobile devices.

6. Resetting and alternative access methods

If none of the methods worked, the reset remains. USB-storage or use of alternative means of connection.

Resetting:

1. Go to Settings → Applications → Application Management.
2. Find the Storage. USB» (or «USB-” and put it in the snare” and.
3. Select “Storage” → “Clear Data” and “Clear Cache”.
4. Reboot your smartphone.

Alternative ways to access the flash drive:

• 🌐 FTP-server: Install the application FX File Explorer or Solid Explorer, include them FTP-server and connect to the flash drive via the local network.
• ☁️ Cloud Storage: Copy files from a flash drive to your PC, then upload them to Mi Cloud or Google Drive and download to your smartphone.
• 🖥️ PC Connection: Use Mi 9 as an intermediary: connect the flash drive to the smartphone, and the smartphone itself to the computer in mode MTP. Sometimes the PC "sees" the flash drive through the phone.

⚠️ Attention: Resetting settings USB remove all stored permissions for external drives, after which it may be necessary to re-format the flash drive (if it was encrypted or used non-standard permissions).

Frequent mistakes and their solutions

We've got a top.-5 Mistakes faced by Xiaomi Mi users 9 When working with flash drives, and ways to eliminate them:

If your problem is not included in the table, try updating the MIUI firmware. In older versions (below MIUI 12) there were bugs with support for exFAT. You can update via Settings → About Phone → System Update.

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90% of problems with flash drives on Xiaomi Mi 9 solved by checking OTG-Adapter, file system change to exFAT or reset USB-Only 10 percent of the time is hardware fault.

FAQ: Answers to popular questions