Xiaomi smartphone users often face the need to expand the built-in storage, especially when it comes to budget but popular models like the Redmi 9. In this model equipped with an NFC module, the procedure for connecting external drives has its own features that are not always obvious at first glance. Many owners wonder why after connecting a flash drive through an adapter, the system does not respond or display files.
The problem is not the lack of technology support, but the specifics of the MIUI shell and the physical characteristics of ports. For USB OTG (On-The-Go) to work, you need to consider a number of factors, from the file system format to the state of battery charging. In this article, we will discuss in detail the algorithm of actions that will allow you to find and use an external drive.
It's important to understand that finding a flash drive is not just a search for an icon on your desktop, but a comprehensive check of hardware and software compatibility. We'll look at the standard system tools, hidden developer settings and third-party utilities that will help solve the problem. The key is to have a proper OTG-Type-C cable or adapter, as without it, physical connection is impossible.
Physical Connection and Compatibility Checking
The first step is always the physical connection of devices. Xiaomi Redmi 9 smartphone is equipped with a port USB Type-C, which supports data transfer and charging, but unlike full-size ones. USB-port on computers, you need a special adapter. OTG, Because cheap analogues may not have the necessary contacts to transmit data.
After connecting the flash drive, pay attention to the charge indicator. If the phone starts to discharge quickly or show power errors, it may be that the drive consumes too much power. USB-externally powered hub, although most standard flash drives do not require this.
- 🔌 Make sure the adapter OTG plugged in the smartphone's jack.
- 💡 Check if the LED indicator on the flash drive itself has caught fire (if any).
- 📱 Clean the dust charging port with compressed air before connecting.
- 🔋 Make sure your phone battery is over 15% for stable operation.
⚠️ Warning: Don't try to force a flash drive into a port without an adapter.Mechanical damage to the Type-C connector will result in costly repairs and loss of warranty.
☑️ Checking the physical connection
System setting and activation of OTG
Unlike some other manufacturers, in the MIUI shell installed on Redmi 9, the OTG function is usually enabled by default and does not require manual activation in the standard settings menu. However, in rare cases or after a firmware update, the system can lock external devices in order to save energy.
Open the Settings menu and search for the word "OTG." If you don't have one, that's fine for your version of the software. If you don't have one, check the About menu. Find the MIUI version and click on it 7 times in a row to activate the Developer mode. Then, in Advanced Settings → For developers, look for "Debugging by USB" or "Default USB Configuration" and set the value "File Transfer".
Sometimes the system blocks the connection of unknown USB-When you first connect, you may see a pop-up asking for permission to access your data. Make sure you select "Allow" or "Always Allow." If the window doesn't appear, try unlocking your phone screen before you plug in the flash drive.
Hidden USB settings
Using a full-time conductor to search for files
After successfully connecting physically and checking the settings, the main tool for finding a flash drive is the built-in file manager. In Xiaomi smartphones, it is called "Conductor" and has a characteristic yellow icon with a folder. This is where the logical structure of the connected storages is displayed.
Run the app and look at the top of the screen, and it should show the Categories, Folders and, most importantly, Internal Drive tabs. If you successfully connect the external drive, a new partition will appear next to the internal memory, often referred to as USB or the name of the flash drive brand (e.g. Sandisk, Kingston).
If the flash drive doesn't appear in the main Explorer menu, go to the Folder tab and scroll to the bottom. Sometimes the system doesn't put the external drive in Favorites, but it's available in the general list of root directories. It's also worth checking the display settings: click on three dots in the corner and make sure that you check the "Show Hidden Files" box or a similar option.
- 📂 Open the Explorer app with a yellow icon.
- 👀 Look for the section "USB" or brand name at the top of the screen.
- 📁 Go to the folder tab if there is nothing in the category.
- 🔄 Press the update button or restart the application.
⚠️ Note: If you see a flash drive but there is an error when you try to open files, it is possible that the drive file system is not supported by Android by default (for example, NTFS).
💡
Use the Cleanup widget in the conductor to free up space in the internal memory before copying large files from the USB drive, which will speed up the system.
Problems with file system formats
One of the most common reasons Xiaomi Redmi 9 doesn’t see the flash drive is file system incompatibility. Android natively and perfectly works with FAT32 and exFAT formats. However, if your flash drive is formatted in the NTFS file system (standard for Windows) or HFS+ (standard for macOS), the phone can detect the physical presence of the device, but will not be able to read the data.
In this case, the notices may indicate that USB-The device is damaged or requires formatting. Be careful: formatting will delete all data. If there is important information on the flash drive, first connect it to the computer, copy the data, and then format the drive into exFAT format. This format supports files larger than 4 GB, which is critical for modern video and documents.
For users who can't or don't want to format a flash drive, there are third-party solutions. exFAT/NTFS for USB by Paragon or Total Commander with the corresponding plugin allows you to read and write data on the Internet NTFS-Once installed, files will be accessed through the interface of the application itself, rather than through a standard Explorer.
| File system | Support for Xiaomi Redmi 9 | Max. File size. | Recommendation |
|---|---|---|---|
| FAT32 | Complete (Native) | 4GB | Perfect for documents and photos |
| exFAT | Complete (Native) | No restrictions. | Best Choice for 4K Video |
| NTFS | Reading only (or via software) | No restrictions. | Requires third-party applications |
| ext4 | Only with Root rights. | No restrictions. | For advanced users |
💡
For maximum compatibility with all devices (TVs, PCs, phones) format the flash drive in exFAT.
Third-party file managers as an alternative
MIUI can sometimes malfunction or hide certain types of files, and in these situations, third-party file managers come to the rescue, who have their own drivers and scanning mechanisms, and one of the best solutions is the Total Commander or FX File Explorer app.
Once you install this app, launch it and provide all the requested storage permissions. In the main menu, you will see a list of available drives. Third-party programs often display the flash drive even when the system conductor is silent, allowing you to copy the data to the internal memory of the phone manually.
Another advantage of third-party software is the ability to work with archives and network storages simultaneously with the help of the Internet. USB-You can directly transfer a file from a flash drive to the cloud or unpack the archive without taking up space in the internal memory of the smartphone, which is especially true for the Redmi 9 model with its limited internal storage capacity.
- 📥 Download Total Commander or CX File Explorer from Play Market.
- 🔓 Give the application full permission to access files.
- 🔍 Find the section USB side-menu.
- 📤 Use the copy function to transfer data.
Diagnosis of problems and frequent errors
If none of the above methods helped find the flash drive in Xiaomi Redmi 9, perhaps the problem lies deeper. Check the error log in the Settings menu → About Phone → All settings → Processor (click on the kernel version several times if available) or simply restart the device with the USB drive connected. Sometimes the USB driver is not initialized the first time you turn on.
Also worth considering is the memory limit. While Android supports large volumes, older or poor-quality USB drives of 128GB or higher may not be detectable due to lack of current or controller limitations.
In rare cases, the problem may be due to damage to the Type-C port itself in the phone, even if charging is normal. Contacts responsible for data transmission can oxidize. Careful port cleaning with alcohol and toothpick (with the phone switched off) can solve the problem.
⚠️ Warning: If the phone gets too hot at the USB stick connection, immediately turn off the device. This may indicate a short circuit in the adapter or drive.