Many owners of the Redmi Note 7 smartphone are wondering how to connect an external flash drive or keyboard to the device. This is absolutely normal, because there is no built-in memory card slot in this model, and the volume of modern photos and videos is growing every day. Fortunately, Xiaomi engineers have provided support for USB On-The-Go technology, which allows you to turn your phone into a full-fledged hub for working with the periphery.
Unlike older models that required picking through the engineering menu or getting superuser rights, modern MIUI shells are much smarter. You don't have to search for hidden switches in the depth of settings or download questionable applications from the Internet. The system will identify the connected device and offer options for its use, if the basic technical conditions are met.
But there are some things that are not mentioned in the booklets, like formatting the drive or limiting the power of the connected hardware, and in this article, we'll not only look at the connection process itself, but also explain why sometimes the phone doesn't see the flash drive, even though it's good, and how to properly prepare the external drive and what commands you might need in rare cases.
What is OTG technology and why is it needed
OTG stands for On-The-Go. It's a standard designed to allow mobile devices to act as hosts for other gadgets. In the past, your phone could only charge from a computer or transmit data at its command. Now the Redmi Note 7 itself becomes the control center that feeds power and reads data.
The scope of this feature goes far beyond just copying photos: you can connect a wired computer mouse to edit images more accurately, or a full-fledged keyboard for typing in documents. Gamers will appreciate the possibility of using wired gamepads that provide minimal input latency, which is critical in shooters.
You can also connect external sound cards, podcast microphones, and even wired Internet Ethernet adapters if the Wi-Fi signal is unstable, and it's important to understand that USB is the one that's going to be power distribution, so the phone will be using up the battery when it's working with the connected devices.
Do I need to manually activate the function in MIUI?
One of the most common myths is that Xiaomi has a special switchboard called "Enable OTG", which is turned off by default to save energy. Users spend hours searching for this item in the "Developers" menu or in hidden settings. We hasten to reassure you: in current versions of MIUI firmware for the Redmi Note 7, such a switch simply does not exist.
It works at the hardware level of the controller, and it activates automatically when you detect the connection. Once you insert the adapter into the connector, the system quizzes the device. If it is correctly identified as a drive or input device, the OS instantly rebuilds the logic circuits of power and data transfer.
⚠️ Note: If you find instructions online that require you to enter commands through ADB or install root rights to activate USB-On the global and Chinese versions of the Redmi Note 7 firmware, this is not required and may lead to a software failure.
The only thing that you might need to do is to have the storage format. Android is by default friendly to the FAT32 file system. If your flash drive is formatted in NTFS (Windows standard), the phone might suggest that it be formatted, which will delete all the data, or it won't offer anything just by not showing the files.
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Use a file manager with NTFS support, such as Microsoft exFAT/NTFS for USB by Paragon, if you don’t want to format the flash drive and lose data.
Preparation of equipment and compatible formats
Before trying to connect a heavy external hard drive, it is worth considering the technical limitations.The USB Type-C port on board the Redmi Note 7 has a current output limit. Standard values usually do not exceed 0.5-0.9 Ampere without using an active hub with additional power.
This means that a small flash drive or LED-The phone will power the lamp without problems. However, a mechanical hard drive may not start, and in the worst case, it may go into a restart cycle or lock the port until the battery is completely drained. USB-hub.
The file system deserves special attention. As mentioned earlier, native support for Android is sharpened for FAT32 and exFAT. These formats are universal and readable on most devices. However, FAT32 has an unpleasant limitation: it does not support files larger than 4 GB. If you plan to transfer movies in high resolution, you should choose exFAT.
Below is a table of compatibility of file systems with the MIUI shell:
| File system | Max. File size. | Support for MIUI | Recommendation |
|---|---|---|---|
| FAT32 | 4GB | Complete. | For flash drives up to 32GB |
| exFAT | 16 TB | Complete. | Optimal for large files |
| NTFS | 16 TB | Reading only (often) | PC only, you need drivers. |
| ext4 | Depends. | Only Root. | For advanced users |
☑️ Checking before connection
Step-by-step instructions for connecting external devices
Connecting your smartphone to the periphery is as simple as possible and requires no complicated manipulations. You will need the Redmi Note 7 itself, the USB Type-C adapter on USB-A and the plug-in device. Make sure the adapter supports data transfer, not just charging, as visually they are often identical.
Insert the narrow part of the adapter into the charger socket to the end. You should feel a slight click or tight fit. Don't put too much effort into the contact group of the port, which Type-C is quite gentle when handled sloppy.
After connecting the flash drive at the top of the screen, in the notification area, a system icon should appear. USB. If you pull the curtain down, you will see the message "Connected". USB-Device" or prompt to open the file manager to view the content.Click on the notification to go to browsing files.
If you connect a keyboard or mouse, the cursor or text field will appear on the screen automatically. No drivers need to be installed, since all the necessary components are already sewn into the Linux kernel on which Android is based.
⚠️ Warning: Never remove a flash drive by simply pulling out of a port while writing data.This is guaranteed to damage the file spreadsheet and lose information. Always use the "Safe Retrieval" command in the notification curtain.
File management and storage management
Once you've successfully connected, you'll have file management. The standard MIUI Explorer automatically detects the external drive and displays it in the side menu or on the Overview section's home screen, where you can copy, move, delete and rename files just like you would in internal memory.
For more advanced work, such as working with archives or hidden folders, it is better to install a third-party file manager, such as Total Commander or FX File Explorer, which provide access to more subtle settings and allow you to mount the drive as a local network.
It's important to remember folder structure. Applications often create their directories on an external medium. If you're transferring application data (like game cache), follow the instructions:
- 📂 Create a folder with the name Android at the root of the flash drive.
- 📂 Inside, create an obb or data folder depending on the file type.
- 📂 Copy the contents of the corresponding folders from the internal memory of the phone.
- 📂 In the application settings, specify a new path to data, if such a function is provided by the developer.
What to do if your phone says "File system is damaged"?
The solution: why the phone can't see the flash drive
Even with all the instructions, there can be situations where the Redmi Note 7 ignores the connected device.The first and most common cause is a physical malfunction of the adapter. Cheap Chinese adapters often contain only contacts for charging, ignoring data lines.
The second reason could be contamination of the Type-C port. The pockets are filled with pile and dust, which are compressed and interfere with contact. Carefully, using a wooden toothpick or a plastic shoulder blade, clean the connector. Metal objects are not recommended to be used to avoid short circuits.
Also worth checking is the power saving settings. In rare cases, aggressive MIUI optimization can block the power supply to the port to save charge. Try turning off Super-Savings mode or rebooting the device with an adapter already connected.
- 🔌 Try another one. USB-cable or adapter (accessoir malfunction).
- 📱 Reboot your smartphone with the connected device (controller reset).
- 💾 Check the flash drive on another device (excluding the drive breakdown).
- ⚙️ Make sure that the formatting is done in MBR, not GPT (for older versions of Android).
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In 90% of cases, the problem is solved by replacing the USB-C adapter with a high-quality analogue with support for data transfer, not just charging.