Owners of budget and mid-budget smartphones Xiaomi and Redmi often face a shortage of built-in storage, especially when installing heavy games and applications. built-in 64 or 128 gigabytes fill up lightning fast, which leads to a slowdown in the Android operating system. Using an external drive through a USB Type-C port becomes the only effective way to solve the problem without buying a new device.
OTG technology allows you to connect peripherals directly to a mobile gadget, turning a regular flash drive into additional storage. However, simply inserting the drive is not enough: to fully work with programs requires the correct configuration of the file system. Without a competent approach, the phone will see only media files, ignoring the possibility of installing software.
In this guide, we will take a detailed look at formatting, file system selection, and data transfer, and how to make MIUI or HyperOS perceive an external disk as part of a system partition, freeing up valuable gigabytes of internal memory for mission-critical tasks.
Compatibility check and OTG support
Before buying accessories, you need to make sure that your smartphone supports host mode.Virtually all modern Xiaomi models, starting with the Redmi Note 4 series and later, have built-in support for USB OTG. However, in older or ultra-budget models, this feature may be software limited or physically absent due to savings on the power controller.
For quick diagnostics, you can use third-party utilities from Google Play, such as USB OTG Checker. The application will instantly analyze the configuration of the kernel and give the result. If the result is negative, software methods will not help - you will need hardware modification or replacement of the device.
Power consumption is important to consider: Powerful self-powered drives or external hard drives may require more power than a smartphone port can deliver, in which case the system can automatically block the connection to protect the motherboard from overcurrent.
Choosing the right storage and adapter
The market offers many connectivity options, from classic flash drives to specialized harvesters, and for permanent use, it is better to choose models with a USB Type-C form factor that do not require unnecessary wires, which reduces the risk of adapter loss and mechanical damage to the port.
Read and write speeds directly affect usability. If you plan to run applications from a flash drive, the minimum speed should be USB 3.0 or higher. Cheap 2.0 drives will create a narrow neck, causing interface lags and long downloads of programs.
- 🔌 Double-sided flash drives - have connectors USB-A Type-C, ideal for transferring data between PC and phone.
- 📶 Wireless drives – connect over Wi-Fi, do not occupy a port, but have a lower data transfer speed.
- 🔋 Active hubs – necessary for connecting external hard drives, as they have their own power supply.
When choosing a case, consider the material of the case: metal flash drives better remove heat, which is critical when writing large amounts of information for a long time. Plastic models can overheat, which will lead to trottling and lower speed.
Formatting a flash drive for Android
The standard Windows NTFS file system is often not readable by Android without superuser rights or special drivers. For maximum compatibility, it is recommended to use the exFAT or FAT32 format. The former allows you to store files larger than 4 GB, the latter is the most versatile, but has limitations.
The formatting procedure can be done directly on your smartphone. Go to Settings → The phone. → Find the storage unit. USB-the drive in the list and select the formatting option. The system will warn you to delete all data, so back up in advance.
☑️ Preparation for formatting
⚠️ Note: After formatting with internal memory, access to files from other devices (PC, TV) will be closed without re-formatting.
If the built-in tools can't format, use a PC. Put a flash drive into your computer, open Disk Management and create a new simple volume. Choose exFAT and the default cluster size as your file system, which will provide the best performance in an Android environment.
Configure as an internal memory (Adoptable Storage)
Adoptable Storage, which is built into Android 6.0, allows you to combine external storage with internal storage, but manufacturers, including Xiaomi, often hide this option in the standard interface. ADB (Android Debug Bridge).
First, turn on the developer mode. Go to Settings. → About the phone and seven times quickly click on the build number MIUI. Then, in the advanced settings, activate “Debugging by” USB». Connect the phone to the computer and execute a command in the terminal.
adb shell sm set-force-adoptable trueOnce you've done the command, restart the device. The next time you connect the flash drive, the system will suggest using it as internal memory. Choose this option and wait for the data to migrate. It can take a long time depending on the amount of information.
What happens if the ADB team doesn’t work?
Not all applications support external storage. Software developers may prohibit installation outside the main partition for security or stability reasons, in which case only the cache or part of the data can be transferred, but not the executable file itself.
Application portability and data management
Once the storage is successfully combined, the system will automatically start to transfer data, and you can manually manage this process through the application menu. Go to Settings → Applications → All applications, select the desired program and click Memory.
If the Move button is active, you can change the location of the program, especially for messengers like Telegram or WhatsApp, which accumulate gigabytes of media files, and moving the database to a fast flash drive will significantly speed up the chats.
| Type of data | Recommended seat | Impact on speed |
|---|---|---|
| System applications | Internal memory. | Critical (high) |
| Messengers | Internal / Fast flash drive | Average. |
| Photos and videos | External drive | Low. |
| Cache games | Internal memory. | High. |
Check the state of the drive regularly. File systems on flash drives are susceptible to fragmentation faster than on embedded memory chips. Periodic defragmentation or re-formatting will help maintain a high response rate of the system.
Possible problems and ways to solve them
The most common problem is suddenly turning off the drive, which can be due to poor contact, software failure or power shortage. Try clearing the Media Storage cache in the application settings, hiding the system processes.
If the phone stops seeing the flash drive after it's gone from sleep, there may be a power saving conflict in the battery settings, find the process that drives USB and stop it from auto-starting or limiting background activity, which will prevent the port from shutting down.
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Use a root-enabled file manager, such as MiXplorer, to force obb and data folders to move if standard methods don’t work.
⚠️ Attention: Frequent formatting and writing reduces the life of flash memory. Do not use cheap drives of unknown brands to constantly work the system.
In some cases, resetting network and Bluetooth settings helps, as communication modules can conflict with the USB controller. If nothing helps, check the flash drive for errors through the computer by running a disk check in the properties of the volume.
Security and retrieval of the device
Since the flash drive works as part of the system partition, simply pulling the device out is unacceptable, it can damage the application database and corrupt the file system. Always use software shutdown through the notification curtain or settings.
Click on the USB icon in the control panel and select "Secure Retrieval." Wait for the system to confirm that the device can be disabled, only after that the physical shutdown will be safe for your data.
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Secure extraction is critical when using a flash drive as internal memory, as there is an active process of writing system logs and cache.
To improve data security, it is recommended to enable device encryption, in conjunction with formatting the flash drive as internal memory, this will create a double loop of protection, even if you lose your phone, attackers will not be able to read the data from the retrieved drive without unlocking the main device.