Mobile devices of the Redmi series have long established themselves as reliable multimedia centers capable of storing huge amounts of data. However, the internal memory of the Xiaomi Redmi Note 7 smartphone sooner or later begins to be lacking for storing high-resolution photos, 4K-In this situation, users often resort to using external drives connected via a port. USB Type-C.
The process of preparing the external drive to work requires proper formatting, since the file system of the drive may not be supported by the Android operating system by default. Incorrect data structure will lead to the inability to read files or completely ignore the device by the phone. In this article, we will discuss in detail how to safely and efficiently format the USB drive using only the resources of your smartphone.
It's worth noting that formatting completely destroys all the data on the media, and if there's important information on the flash drive, it needs to be copied to the computer or to the cloud, and ignoring this rule will lead to irretrievable loss of files that can't be recovered by standard means.
Preparation of equipment and compatibility check
The first step before any manipulation of the file system is to check the physical compatibility of the equipment. The Redmi Note 7 smartphone is equipped with a USB Type-C port that supports OTG (On-The-Go) technology. This allows the phone to act as a host and supply power to the connected devices, but the current power is limited.
To connect the standard USB-You need a special adapter or cable adapter, and the quality of this accessory plays a critical role: cheap Chinese counterparts often do not have the necessary resistance to correctly determine the device by the system. If your phone is not responding to the connection, try replacing the cable.
Mechanical hard drives may require more power than the smartphone port can give, which will lead to permanent shutdowns or read errors. USB-powerhouse.
- 🔌 Make sure you have a quality adapter. USB Type-C on-- USB-A supportive OTG.
- 💾 Check that the flash drive is physically healthy and readable on other devices (PC, laptop).
- ⚡ For large amounts of data (more than 64 GB), it is desirable to use drives with their own power.
⚠️ Warning: If the flash drive starts flashing or the device runs out quickly, turn off the drive immediately.This may indicate a short circuit or exceeding the current limit.
After a physical connection, the system must make a characteristic sound or show a notification of the connection of a new one. USB-If this does not happen, check the settings in the Settings section. → The phone. → Version. MIUI (to enable the developer mode, if required, or simply restart the smartphone with the connected flash drive.
Choosing a File System for Android
The Android operating system installed on the Xiaomi Redmi Note 7 supports several major file systems, and choosing the right format directly affects compatibility with other devices and the maximum size file that can be written to the drive.
The most versatile option remains FAT32, which is readable by almost any device, from old car radios to modern TVs and game consoles, but has a significant limitation: you can’t write a file larger than 4 GB to a FAT32 disk.
The more modern standard is exFAT. It has no file size restrictions and works great with large amounts of memory. Most modern smartphones and computers running Windows 10/11 and macOS work with this format without problems, but old media players or car stereo systems may not see it.
| File system | Max. File size. | Compatibility | Recommendation |
|---|---|---|---|
| FAT32 | 4GB | Maximum (all OS, TV, auto) | For music, documents, photos |
| exFAT | 16 TB (theor) | High (Android, Win 7+, macOS) | For 4K video, games, backups |
| NTFS | 16 TB (theor) | Windows and Android only (via drivers) | Only for working with PCs |
The third option is NTFS. It's the native Windows file system. Android-based smartphones can often read these drives, but writing to them without special applications or superuser rights may not be available. It only makes sense to use this format if the flash drive is used primarily with Windows computers.
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If you plan to use the flash drive only with your phone and a modern PC, choose exFAT.This will provide better performance and no restrictions on file size.
Formatting through smartphone settings
The easiest and safest way to prepare the drive is to use the built-in MIUI system. This method does not require the installation of third-party software and minimizes the risk of errors. Before starting the procedure, make sure that the battery charge of the phone is at least 30-40%.
After connecting the flash drive through OTG-cable, the notification curtain will show the corresponding icon «USB-drive" or go to the Settings menu → Memory. In the list of available storage, you'll see a connected external drive.
In the disk management menu that opens, you need to find the "Clean" or "Format" button, and the system will warn you that all data will be deleted, confirm the action, and the process will take from a few seconds to a couple of minutes depending on the amount of memory.
☑️ Algorithm of formatting in MIUI
Some versions of MIUI firmware may require you to choose whether to use the drive as a portable storage device or as part of internal memory. For flash drives, it is recommended to choose portable storage to be able to easily retrieve them and connect them to other devices without losing data.
⚠️ Warning: Do not remove the flash drive during the formatting process. Interrupting the service data record can damage the memory controller, after which it will be extremely difficult to restore the device.
Use of third-party applications
Built-in tools don’t always format the disk into the right file system, especially if the standard MIUI interface offers only one option or gives an error, in which case specialized applications from the Google Play store come to the rescue.
One of the most popular and functional tools is the DriveDroid app (requires Root) or simpler utilities like USB OTG Helper and File Commander, which allow you to manually select formatting options, ignoring system constraints.
When using third-party software, it is important to carefully monitor which drive is selected as the target. An error in choosing a letter or volume name can lead to the formatting of the phone's internal memory instead of a flash drive. Always double-check the disk volume before starting the process.
- 📲 File Commander: allows you to manage files and format external drives in the FAT32/exFAT.
- 🛠 USB OTG Checker: A diagnostic utility that can also perform basic operations on a file system.
- 💾 SD Maid: a powerful cleaning and maintenance tool that has external partitioning functions.
Some applications may request advanced permissions via ADB (Android Debug Bridge).If you're a confident user, connecting to a computer and using the command line gives you maximum control over the process, but for most tasks, conventional applications are enough.
What if the app writes “mounting error”?
Solving Typical Errors and Problems
Even if you follow all the instructions, users of the Xiaomi Redmi Note 7 can encounter various errors: the system can write “File system is corrupted”, “Formatting is required” or simply not display files.
If the phone sees a flash drive but can't read it, try formatting it on your computer to FAT32, which is the most compatible option, but if you try to write a large file, you've got a 4GB file system and you've got to change it to exFAT.
Power problems often manifest themselves as cyclical connection and disconnection of the device (ding-ding sound), in which case the phone does not have time to identify the disk. USB-Hub or switch to a lighter drive (a flash drive instead of a flash drive) HDD).
Sometimes cleaning the Media Storage cache helps. Go to Settings → Apps → All Apps → Show System Processes → Media Storage → Clear. After that, you need to restart your smartphone.
⚠️ Attention: If the flash drive is no longer detectable on all devices (PC, TV, other phones) and heats up in the connector area, there is likely a physical failure of the controller.
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90% Problems with reading flash drives on Xiaomi are solved either by changing the file system to the new one. FAT32/exFAT, substituting OTG-cable.