Connecting external drives, keyboards or game controllers to a smartphone makes a mobile device a full-fledged working tool. POCO Often faced with the question of activation USB-host, because by default, the system may not respond to the inserted USB drive. MIUI HyperOS, which requires the right approach to setting up.
OTG (On-The-Go) allows the smartphone to act as the host, feeding power to the periphery and reading data from it. Unlike some other manufacturers, which hide the switch in the depth of the menu, in Xiaomi smartphones this process is often automated, but requires compliance with certain conditions. Understanding the principles of the file system and the settings of energy saving will help to avoid typical errors when connecting.
In this article, we will discuss in detail the algorithm for activating an external drive, consider the nuances of working with different file formats and provide solutions for cases when the phone has stopped seeing connected devices, you will learn how to format disks correctly and which applications are best for working with files on Android.
What is OTG and how does it work on Android
USB On-The-Go technology was designed to extend the functionality of mobile gadgets without the need for a computer. The essence of the technology is that a smartphone can switch from device mode (when it is charged or transmitted to a PC) to host mode, controlling external devices. To implement this mechanism, the corresponding controller must be present in the hardware of the phone, and in the software – driver support.
In the Xiaomi ecosystem, OTG support is built into the Android kernel, which means that a separate on/off switch is often not available in the standard settings menu. The system automatically detects the connection of a compatible device via a USB Type-C or Micro-USB port and initiates the file system mounting process. However, automation does not always work perfectly, especially with devices that require high power consumption.
It's important to understand the difference between simple data transfer and power. When you plug in a flash drive, the smartphone starts to give out 5 volts per port. If the hard drive connects, it may not have enough current and need active power. The file system also plays a critical role: native support for Android works best with FAT32 and exFAT formats, whereas NTFS may require third-party drivers.
⚠️ Note: Long-term use of the function OTG, Especially with energy-intensive devices, it causes the battery to run out of power, and it's recommended that you monitor the level of charge so you don't get out of touch at a critical time.
Compatibility check and equipment preparation
Before you try to activate a connection, you need to make sure that your Xiaomi device is technically capable of running in host mode. Virtually all modern models, from the budget Redmi series to the flagship Mi, support this feature. However, older or ultra-budget models may have limitations on the current of return or lack the necessary drivers in the firmware.
The adapter or cable is critical. Cheap adapters without a controller can physically connect contacts, but they can’t provide the right handshake signal between the phone and the drive. For stable operation, it’s recommended to use original Xiaomi accessories or certified cables from well-known brands that support data transmission standards, not just charging.
Also worth paying attention to the condition of the smartphone connector: Dust, pile and oxidation of contacts in the USB-C port often cause unstable connection. Before connecting expensive equipment, carefully inspect the connector and clean it with a dry soft brush or compressed air if necessary, avoiding the use of metal objects.
☑️ Checking connection readiness
Step-by-step instructions for connecting the drive
The process of connecting in MIUI and HyperOS environments is as simple as possible for the user. In most cases, you do not need to search for hidden menus or activate the developer mode. You just need to insert an adapter into the port of the smartphone, and then connect a flash drive or other device to it, the system should emit a characteristic connection sound and show a notification.
If you don't open automatically, you need to manually start the file manager. Xiaomi smartphones use the Explorer app (or Files) by default. Open it and find a new section in the list of available storages, which is usually designated as the "Files" app. USB-a drive or a flash drive brand name, and clicking on this section will open up access to the files.
In some cases, especially when connecting devices with an NTFS file system, the system may suggest formatting the drive. Formatting will completely remove all data from the flash drive, so be sure to back up important information on the computer before this action. If formatting is not possible, you will need to install a third-party application to work with NTFS.
Settings → About the phone → MIUI version (7 times) → For developers → Debugging by USBSometimes for the correct operation of specific equipment (for example, sound equipment) DAC-Professional controllers or service providers may need to enable debugging USB. To do this, go to Settings, select About Phone and quickly press 7 times on the Version item. MIUI. After the message “You became a developer” appears, go back to the main settings menu, open Additional settings. → For developers and activate the toggle switch USB.
What if the phone doesn’t see the flash drive right away?
File Systems: FAT32, exFAT and NTFS
One of the most common reasons why Xiaomi does not see the flash drive is the incompatibility of the file system. Android is originally designed to work with the FAT32 format, which provides maximum compatibility, but has a limit on the size of a single file (no more than 4 GB).
The more modern standard is exFAT. This format supports huge files and works great on modern Redmi and POCO smartphones. If your flash drive is formatted in exFAT, it should be determined by the system without additional manipulation. Problems most often arise with the NTFS format, which is native to Windows, but not always supported by Android out of the box.
To work with NTFS-Drives without formatting can use special applications-drivers, such as Microsoft exFAT/NTFS for USB Paragon Software or Total Commander with a plugin, these programs create a bridge between the system and the disk file system, allowing you to read and write data directly through the file manager interface.
| File system | Max. File size. | Compatibility with Android | Recommended use |
|---|---|---|---|
| FAT32 | 4GB | Complete (native) | Documents, photos, music |
| exFAT | 16 TB (theoretically) | High (on new models) | 4K movies, big archives |
| NTFS | 16 TB (theoretically) | An annex is required | Working with PC and Android |
| ext4 | Depends on size. | Only with Root rights. | System partitions, Linux |
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If you plan to transfer files frequently between your PC and phone, format the flash drive to exFAT.This will provide file support of more than 4 GB and compatibility with both devices without installing additional software.
Configuring energy consumption and eliminating errors
Xiaomi smartphones are known for aggressive energy saving system that can block the work USB-If the flash drive is detected but disappears or doesn't read immediately, try turning off the power savings for the Explorer or Files app".
To do this, go to Settings → Applications → All applications, find your file manager, select Battery and set No Limits. This will prevent background MIUI optimization services from forcing you to stop reading data. It is also worth checking if flight mode is enabled, which sometimes affects the operation of communication controllers.
If the problem persists, it may be a power shortage (HDD) Directly to the port of the phone is often impossible due to the high initiation current. USB-externally powered hub that will take energy from the outlet, not from the smartphone battery.
⚠️ Note: Do not connect devices with your own high power consumption (for example, powerful external devices) to your smartphone. HDD without power) through simple passive adapters, which can cause a power surge and damage to the power controller on the phone's motherboard.
Using OTG for peripherals: keyboards, mice and gamepads
OTG isn't just limited to flash memory. If you plug in a normal computer mouse, you'll see a cursor on your smartphone screen, which makes navigation much easier, especially if the sensor is damaged or malfunctioning. The keyboard allows you to quickly type text in messengers or documents, turning the phone into a mini laptop.
Gamers can also evaluate the ability to connect wired gamepads. Many console emulators (PSP, PS1, Sega) on Android support input from external controllers via USB. To activate control, you may need to adjust the buttons in the parameters of a particular emulator, but basic device recognition occurs automatically.
When connecting multiple devices at once (via a hub), it is important to consider the order of connection. It is recommended to first connect the hub to the phone, wait for its initialization, and only then connect the peripherals. In rare cases, an application may be required to reassign keys if the standard keyboard layout does not match the language of the device.
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Xiaomi smartphones support simultaneous operation of the mouse, keyboard and drive when using active USB-Hub with external power, which turns the phone into a full-fledged workstation.