Modern Xiaomi smartphones, running on the shell MIUI or HyperOS, have powerful multimedia capabilities, but internal memory is sometimes not enough to store huge libraries of movies or work documents. Using external drives through the USB Type-C port is a great solution for expanding storage, but often users are faced with a situation when the phone does not see the connected flash drive or refuses to play files from it. This is due to incompatibility of file systems, since Android has its preferences for data structure.
The procedure for bringing the drive to a working state is called formatting. Formatting is the process of markup of the disk, which creates a new file system, while removing all the old data. For owners of Redmi and Poco devices, this operation can be performed directly in the interface of the smartphone without the need to connect to a computer. OTG-Functions and ability to write files of any type.
In this article, we will discuss in detail how to safely conduct this procedure, what are the nuances of choosing a file system and what to do if standard methods do not solve the problem. You do not need to be a technician to perform these actions, you should follow the instructions carefully enough, we will also touch on the topic of data security, since the process irreversibly deletes information.
Preparation of the device and check the compatibility of the OTG
Before you start any data manipulation, you need to make sure that your device is physically and software-ready to work with the external peripherals. OTG (On-The-Go) technology allows the smartphone to act as a host, supplying power to the connected devices. In the vast majority of modern Xiaomi models, this feature is enabled by default, but in rare cases, especially on older firmware or specific regional versions, it needs to be activated manually.
To check for support for the technology, go to the system settings via Settings → Advanced Settings → OTG. If there is no such item in the menu, then the function is activated automatically when you connect a compatible drive. It is important to use high-quality adapters or cables, since cheap accessories may not provide enough voltage, which will lead to unstable operation or complete lack of system response to the connection.
⚠️ Before starting any work with the file system, make sure that the battery charge of the smartphone is at least 30-40%. Sudden power outage at the time of writing partition tables can lead to a software failure in the operation of the phone memory controller.
It is also worth checking the physical condition of the USB Type-C or Micro-USB port. The presence of dust, pile or oxidation of the contacts can interfere with normal connection. Carefully inspect the connector in good lighting and, if necessary, clean it with a non-metallic object, such as a wooden toothpick. After cleaning, try to connect the flash drive again and observe the reaction of the screen.
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Use the original Xiaomi adapters or certified OTG cables. Cheap analogues with AliExpress often do not have the resistor inside to identify the device, which is why the phone simply will not “see” the flash drive.
File system selection: FAT32, exFAT or NTFS
One of the keys to successful formatting is choosing the right file system type. Android, like many other operating systems, has limitations on reading and writing data depending on the format chosen. FAT32 is the most compatible standard, supported by almost any device, from old in-car radios to modern TVs. However, this format has a significant limitation: it does not support storage files larger than 4 GB.
If you plan to store high-resolution movies or heavy archives with working projects on a flash drive, you’ll need a more modern file system. exFAT is devoid of a 4GB limit and works great with large amounts of data while maintaining good compatibility with Android. This format is most often recommended for microSD cards with a capacity of 64 GB and above. USB-accumulator.
NTFS is native to Windows operating systems. Xiaomi smartphones can read such drives, but write mode is often unavailable without installing additional applications or having root rights. Using NTFS on your phone is impractical unless you plan to constantly transfer the flash drive between your PC and smartphone for specific tasks.
Why can’t the phone see a file larger than 4GB?
When choosing a format, be specific to your needs. FAT32 is enough for music and documents. For a 4K video media library, choose exFAT. Below is a comparison table to help you decide on your choice.
| Parameter | FAT32 | exFAT | NTFS |
|---|---|---|---|
| Max. File size. | 4GB | No restrictions. | No restrictions. |
| Compatibility with Android | Full (read/write) | Full (read/write) | Often just reading |
| Compatibility with TV/auto | Tall. | Medium/High | Low. |
| Recommended level | Up to 32GB | 64 GB and higher | Any (for PC) |
Formatting through built-in MIUI and HyperOS
The easiest and safest way to prepare a flash drive for work is to use Xiaomi's built-in file manager, which does not require third-party software installation and minimizes the risk of errors. OTG-cable, a notification of connection should appear on the screen USB-Click on it to go to the control menu, or just open the File Manager app).
In the conductor interface, find the partition that's responsible for external drives. It's usually labeled as "USB" or the name of the flash drive manufacturer. Click on it to open the contents. Then you need to call the context menu. To do this, click on three dots in the upper right corner of the screen or make a long tap on the icon of the drive itself in the list of available storages until the action menu appears.
☑️ Checklist before formatting
In the menu that opens, select Format. The system will give a warning that all data will be destroyed. Confirm the action by pressing OK or Format. Some versions of MIUI firmware may have a file system choice. If you have that choice, choose exFAT for large storage or FAT32 for compatibility with older technology.
⚠️ Note: Integrated formatting in MIUI often chooses the file system that it considers optimal if it is critical to keep a certain format (e.g., the file system that it considers optimal, FAT32 for the tape recorder) and the phone offers only exFAT, use a computer or third-party apps.
Use of third-party applications for advanced settings
When standard tools fail to format a flash drive, or need to choose a specific cluster size, specialized utilities come to the rescue. One of the most popular and functional tools is the DriveDroid application (requires root) or simpler managers like USB OTG Helper and File Commander, which allow access to low-level formatting functions.
Consider a process like a universal file manager with extended rights. Once you install the application, give it the necessary permissions to access the storage. Connect the flash drive and find it in the list of devices in the application. Select the drive and find the option "Format" or "Format Device" in the menu. Here you will probably be asked to choose the file system from the list: FAT, FAT32, exFAT, NTFS.
An important parameter in advanced formatting is the size of the cluster. By default, it is recommended to leave the value of "Default" or "Default". Changing this parameter to a smaller value can slightly increase the efficiency of space use when storing many small files, but reduce the overall speed of work. Increasing the size of the cluster will speed up work with large files, but can lead to loss of space ("waste" of disk space).
Once you select the settings, start the process. The application can request proof of superuser rights if they are required to work directly with the drive. If root rights are not available, the application will work within the standard Android restrictions, which in most cases is sufficient for conventional formatting in FAT32 or exFAT.
Solution: mistakes and ways to eliminate them
It's quite common for users to have a situation where the phone sees a flash drive, but it gives an error when trying to format or write files «USB-The device is corrupted" or "Formatting required" that appears in a cyclical pattern, which may indicate a logical error in the file table or that the flash drive was removed without first safely retrieving it.
In such cases, try using your computer for primary cleaning. Connect the drive to your PC, open "My Computer," right-click on the drive, and select "Format." Uncheck the "Quick Format" box to do a full sector check. This will take longer, but will reveal and block the broken sectors, if any.
⚠️ Note: If, after full formatting on the computer, the flash drive continues to work unstable, warm up or disappear from the system, there is a high probability of a physical malfunction of the controller or memory. Operation of such a drive with a phone can lead to port overload and damage to the smartphone motherboard.
Another cause of error may be energy saving: Some Xiaomi models aggressively save charge and can turn off power USB-Try connecting your phone to the charger while you're using the flash drive. Also check in the battery settings if the backup activity restriction for the file manager is worth it.
If nothing works, and the flash drive is not detected on any device, it may have gone into read-only mode because the rewrite resource has run out, and this is a flash memory security mechanism that signals the end of the life of the drive, so you can't software-enable it, you need to replace the storage device.
Safe recovery and maintenance of the storage device
Properly operating external memory extends its life and preserves the integrity of your data. Never pull a flash drive from a phone port when writing or reading files. This can damage the file table and cause data loss. Always use the Safe Retrieval feature that is available in the notification curtain or in the Explorer menu.
For extraction through the interface MIUI: Lower the top notification curtain, find the icon USB-You can press the "Disable" or "Extract" button, wait for the message that the device is safely disabled, and then physically remove it from the port. This simple habit will save you from many problems in the future.
Check the state of the drive regularly. Every few months, it is recommended to connect the flash drive to the computer and run an error check. Also, monitor the temperature of the device: if the flash drive gets hot to the touch during prolonged operation, take a break. Overheating negatively affects the speed and durability of memory chips.
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Secure extraction via the software menu is a must-have procedure to prevent logical errors and data loss, especially when working with large files.
Keep the flash drive in a safe place when it is not in use, contacts should be closed from dust and moisture, using protective caps or cases will help to avoid oxidation and mechanical damage, which often cause the device to fail to work with the phone.