The use of external drives on Xiaomi smartphones has become a common necessity, especially when the built-in memory is not enough for high-resolution photos and videos. However, before a flash drive will work correctly with your device, it often needs to be prepared in a special way. The formatting process deletes all old data and creates a new file system that is understandable to the operating system Android and shell MIUI. This is a critical step that cannot be ignored if you want to avoid read errors or file loss in the future.
Many users experience that the phone sees the drive, but refuses to write information to it or asks to erase it. In this article we will analyze in detail how to correctly carry out this procedure directly on the phone, what settings to choose and what to do if standard methods do not work. You will learn about the differences between memory operating modes and how to protect your data before starting work.
Preparing the drive and selecting an adapter
The first step is to physically connect the device. You will need the drive itself and a special adapter OTG (On-The-Go), which converts the connector USB Type-A to Micro-USB or Type-C, depending on the model of your smartphone. Make sure the adapter is working properly and supports data transfer, not just charging. The quality of the contact plays a decisive role: a poor connection can lead to interruption of the formatting process and damage to the file table.
Before connecting, it is strongly recommended to copy all important files from the flash drive to a computer or cloud storage. Formatting irreversibly destroys all informationlocated on the media. Even if the system offers to restore data later, the chances of success are minimal, so it is better to play it safe in advance. Also check the battery charge of your smartphone - it must be at least 50% so that the device does not turn off at the most crucial moment.
⚠️ Attention: If your flash drive has a physical write-protect switch (Lock), be sure to set it to the unlock position before connecting to the phone. Otherwise, the system will not be able to make changes to the disk structure.
After connecting, a message should appear in the notification shade indicating that the USB drive is connected. Click on this notification to proceed to selecting the operating mode. At this stage, the system does not format the disk yet, but only offers options for its use. The correct choice determines the further logic of actions and the availability of files for other devices.
Use original or certified OTG cables from Xiaomi - they guarantee stable voltage and correct data transfer, reducing the risk of formatting errors.
External memory operating modes in MIUI
Operating shell MIUI offers two main scenarios for using an external drive, and understanding their differences is critical for proper configuration. The first option is to use it as portable storage. In this mode, the flash drive works like a regular USB drive: you can freely remove it, connect it to your computer and transfer files between different devices without any restrictions.
The second option is internal memory. Here the system encrypts the drive and combines it with the built-in storage of the smartphone. This allows you to install applications directly on the flash drive and free up space in the main memory. However access to files from other devices will be closedand when you remove the disk, the apps installed on it will stop working. The choice depends on your goals: mobility or expanding system capabilities.
- 📱 Portable storage: ideal for watching movies, storing photo archives and quickly transferring data between PC and phone.
- 🔒 Internal memory: suitable if you need to increase the volume to install heavy games and applications, but binds the flash drive to a specific phone.
- ⚡ Operating speed: Internal memory mode requires drives with high write speeds (class U3 or higher), otherwise the smartphone interface may begin to slow down.
If you select internal memory mode, the system will offer to transfer existing data to the new disk. This process may take a long time depending on the amount of space used. Be prepared for the fact that your phone may reboot after setup is complete. In the future, removing such a drive will require preliminary unmounting through the settings, otherwise the data may be damaged.
Step-by-step guide for formatting through settings
The most reliable way to format a flash drive is to use the system's built-in tools. This ensures that the optimal clustering and file system settings are selected that are compatible with your specific machine. Go to the menu Settings, then scroll down to the section About phone or immediately find the item Advanced settings, where storage management is often located.
In more recent versions Android the path may look different: go to Settings → Storage. Here you will see a list of all available drives, including internal memory and connected flash drive. Click on the name of your external drive. The control menu will open, where the Clear or Formatbutton will be available. The system will warn you about data loss again - confirm the action.
☑️ Algorithm of actions when formatting
The formatting process usually takes from a few seconds to a couple of minutes. At this time, do not disconnect the cable or block the smartphone screen so that the process is not interrupted. Upon completion, the system will notify you of success and prompt you to open the file manager to view the content. Now the disk is completely ready to write new files in the mode you have chosen.
⚠️ Attention: The menu interface may vary slightly depending on the version of MIUI (12, 13, 14 or HyperOS). If you do not find the "Storage" item, use the search in settings by entering the word "USB" or "Memory".
Selecting a file system: FAT32, exFAT or NTFS
The file system determines how data is written to the disk and what restrictions exist on file size. The standard choice for Android is FAT32 or exFAT. FAT32 has maximum compatibility: such flash drives can be read by almost any device, from car radios to old TVs. However, it has a serious drawback - the inability to record one file larger than 4 GB.
If you plan to store high-quality movies or large archives, it is better to choose a system exFAT. It removes the file size limit and supports storage sizes greater than 32 GB, while maintaining good compatibility with modern gadgets. The NTFSsystem, popular in the Windows world, on Android often works only in read mode without third-party utilities, so it is least suitable for writing on the phone.
| File system | Max. file size | Compatibility | Recommendation |
|---|---|---|---|
| FAT32 | 4 GB | Universal | For documents, music, photos |
| exFAT | Without restrictions | High (Android, Win 10/11, Mac) | For 4K video, large games |
| NTFS | No restrictions | Low (read-only on Android) | For work only from PC |
When formatting through the phone settings, the system usually selects the best option depending on the size of the flash drive. For drives smaller than 32 GB, FAT32 is often suggested, and for larger ones, exFAT is often offered. It is worth interfering with this choice manually through third-party apps only in specific cases when strict compatibility with older equipment is required.
For most Xiaomi users, exFAT is the optimal choice, as it is a balance between the absence of file size restrictions and support for modern devices.
Use of third-party file managers
Sometimes The built-in system tools do not see the drive or give an error when trying to format it. In such situations, third-party applications come to the rescue, such as Total Commander, Solid Explorer or specialized utilities like DriveDroid (requires root access). These apps may have more advanced algorithms for working with disks and allow you to select formatting options manually.
To format a flash drive through a file manager, open the application and find the section responsible for USB devices. Often this is a separate tab or item in the side menu. Select your drive, open the context menu with a long press and find the formatting option. Some managers may request permission to access system functions - provide it, otherwise the operation will not be completed.
The advantage of third-party solutions is the possibility of detailed configuration. You can choose the cluster size yourself, which affects the speed of reading small files and the efficiency of space use. However, for the average user these settings are unnecessary, and the standard values offered by the system work more stable. Use advanced options only if you understand their purpose.
⚠️ Attention: Third-party applications cannot format a flash drive as “internal memory” with encryption. This function is only available through the Android system settings.
What to do if the application says “Mounting error”?
Most often the problem is a poor-quality OTG cable or insufficient power. Try closing all background applications to free up RAM and reconnecting the cable. If it doesn’t help, check the flash drive on your computer for errors.
Possible errors and ways to solve them
Even if you follow all the instructions, unforeseen situations may arise. One of the most common problems is the message “USB drive is damaged” or constant prompts to format the disk, which do not disappear after the procedure. This may indicate a physical malfunction of the flash drive, worn out memory cells, or damage to the controller. In this case, try connecting the drive to your PC and performing a full (not quick) format there.
Another common mistake is that the phone does not see the flash drive at all. Check whether the function OTG is enabled in the settings of your smartphone. On some Xiaomi models this option is enabled by default, but on others it must be activated manually through a search in the settings or in the "Advanced" section. It is also worth cleaning the phone's charging connector from dust, which may prevent the adapter from making tight contact.
- 🔄 Reboot: a banal but effective method - reboot the phone with a connected flash drive, this will clear USB driver errors.
- 🧹 Clearing the cache: go to application settings, find "Storage" or "Media Server" and clear their cache.
- 🛠️ Check for PC: use the utility
chkdskin Windows to correct disk logical errors before trying again on the phone.
If all else fails, your firmware version may have a temporary bug related to the operation of external drives. In this case, it is worth checking for system updates or reading the forums of the owners of your specific model. Sometimes resetting the phone to factory settings helps, but this is an extreme measure that requires a full data backup.
If the flash drive gets hot during operation, this is normal when recording is active, but if it is hot when idle, it may be faulty or the phone controller is supplying too high voltage.
Frequently asked questions (FAQ)
Is it possible to format a flash drive without losing data?
No, the formatting process, by definition, involves completely clearing the file system and deleting all data. The only way to save information is to first copy it to another device.
Why does the phone not see a 128 GB flash drive?
Most likely, the file system of the drive is not supported by your phone or the USB drivers need to be updated. Try formatting it on your computer in exFAT format.
Is it safe to remove the flash drive by simply pulling out the cable?
Absolutely not. Always use the "Safely Remove" option in the notification shade or in the storage settings, otherwise the files may become damaged or unreadable.
Is it possible to use one flash drive on different Xiaomi phones?
Yes, if you used the "Portable storage" mode. If you select the “Internal Memory” mode, the flash drive will be encrypted with the keys of a specific phone and will not open on another device.
How to find the real writing speed of a flash drive on your phone?
Use applications like AIDA64 or Disk & Storage Analyzerthat can conduct speed tests reading and writing directly on the connected drive.