Xiaomi Redmi 9 is deservedly considered one of the most popular budget devices on the market, offering users a great screen and decent performance for an affordable price. However, one of its weaknesses is the limited amount of internal storage that is quickly filled with modern applications, games and high-resolution photos. When the free space runs out, the system starts to run slower and installing new programs becomes impossible, which forces owners to look for ways to expand.
Fortunately, Xiaomi has provided the ability to connect external drives through the port. USB Type-C, which allows you to convert the usual USB-This solution is ideal for those who do not want to overpay for a version of a smartphone with a large amount of memory or lost the ability to install a microSD memory card. OTG (On-The-Go opens new horizons for file and media management.
In this detailed guide, we’ll take a look at the nuances of connecting external drives to your device, learn how to choose the right adapter, format the media to the desired file system, and set up automatic data portability. We’ll also look at common mistakes users face and suggest effective ways to solve them so that your Redmi 9 works quickly and stably again.
OTG technology and Redmi 9 compatibility
OTG stands for “On-The-Go,” and this technology allows mobile devices to act as hosts for connecting peripherals such as flash drives, keyboards or mice. Xiaomi Redmi 9 fully supports this standard at the hardware level, which means there is no need to obtain superuser rights (root) to work with external drives. USB Type-C port on board the device is able to transfer not only data, but also power to operate the connected gadget.
But there's an important caveat that many beginners forget about: Despite the standard's support, in the MIUI shell, USB-OTG can sometimes be turned off by default or require manual confirmation when you first connect, and this is done to save energy so that the battery doesn't run out of power if some unknown accessory is connected to the phone. So if nothing happens when you plug in the flash drive, don't rush to blame the hardware.
⚠️ Warning: Constant connection of energy-intensive external drives can lead to accelerated battery discharge and heating of the power controller.
For successful work, you will need a high-quality adapter or cable adapter USB Type-C to USB-A. Cheap analogues often do not have the necessary contacts for data transfer and work only for charging, so when buying, you should pay attention to the product specification. A good adapter will provide a stable data transfer speed and will not interfere with the operation of the smartphone radio module.
How to check OTG support without a flash drive?
Choosing the Right File System and Adapter
Before you connect the drive, you need to make sure that your flash drive is formatted in a file system that the Android operating system understands.Naturally, the system works best with the formats FAT32 and exFAT. NTFS file system, standard for Windows, may not be determined without installing additional drivers or special file management applications with support for plugins.
FAT32 is the most compatible format, but it has a serious limitation: it does not support storing individual files larger than 4 GB. If you plan to download high-resolution movies or heavy archives on your phone, it is better to choose exFAT. This format is free of file size restrictions and works perfectly with large amounts of data, making it the best choice for modern smartphones.
When choosing the adapter itself (OTG-cables) follow the following criteria:
- 🔌 Type of connector: Make sure the plug inserted into the phone is shaped USB Type-C, not the old Micro-USB.
- ⚡ Capacity: For fast data transmission, it is desirable to use cables that support standards USB 3.0, although the phone port may limit the speed to USB 2.0.
- 🛡️ Protection: Quality cables have additional insulation and ferrite rings to protect against electromagnetic interference.
If your flash drive has a capacity of more than 32 GB, most likely, it is already formatted in exFAT or NTFS. In case of problems with the definition, the easiest way to format the drive directly on the computer or through the menu of the smartphone itself after connecting.
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Use short cable adapters or monolithic two-in-one flash drives (Type-C + USB-A). Long cables increase resistance and can lead to unstable storage.
Step-by-step instruction for connecting a flash drive
The process of connecting an external drive to the Xiaomi Redmi 9 is as simple as possible by the developers of the MIUI interface. You do not need to be an engineer to perform this operation, just follow a simple sequence of actions.
Follow the following steps to activate external storage:
- Put it in. USB-flash drive in the adapter, and connect the adapter to the charging port of the smartphone.
- Pull the notification curtain from top to bottom and find the connection message USB-device.
- Click on the notification to open the file manager, or select the option "Use as storage".
- If the system requests permission to access files, confirm the action in the dialog box that appears.
Once successfully connected, a flash drive icon will appear in the notification curtain, and a new partition will appear in the File Manager, usually designated as USB or the name of the drive brand. Now you can copy, move and delete files between the internal memory and the flash drive. The speed of copying will depend on the class of the flash drive itself and the quality of the adapter.
☑️ Connection check
In some cases, especially when using a large flash drive (64 GB or higher), the system may suggest formatting the drive. Only agree to this if there is no important data on the flash drive, since everything will be deleted. Formatting will create a new partition table optimized for Android.
Configure and manage files through Explorer
The standard MIUI file manager provides a user-friendly interface for working with two storage sources at the same time. The screen is divided into logical blocks, allowing you to see the contents of the internal memory and the external flash drive. To transfer data, you just need to pinch your finger on the file, select the action "Copy" or "Move" and specify the target directory.
When you're actively working with a flash drive, it's helpful to know a few hidden features of the system, for example, you can set up the display of hidden files if you're transferring system data or app cache, and you can activate the "Show hidden files" switch in the file manager menu (three dots in the corner), which will allow you to see folders that start from the dots that are often used by applications to store settings.
| Action. | Internal memory. | External flash drive (OTG) |
|---|---|---|
| Recording speed | High (UFS) | Depends on the flash drive class. |
| Max. File size. | No restrictions. | 4 GB (FAT32) / No limit (exFAT) |
| Access to applications | Complete. | Requires permits |
| Energy consumption | Standard. | Increased (battery discharge) |
The flash drive is mainly used to store media content: photos, music, videos and documents. However, many video and music-watching apps allow you to choose the path to the file library manually in your settings.
Using a flash drive as an internal memory
Many users are wondering: can you make your phone perceive the flash drive as an extension of internal memory and install applications there? In earlier versions of Android, there was a feature called "Adoptable Storage", but in the shell of the MIUI based on Redmi 9, it is often hidden or completely disabled by the manufacturer, this is done to ensure stability, since the speed of external drives is usually lower than the speed of the embedded chip.
However, there is a way to force this feature through the developer menu, but it requires caution: Forced movement of system partitions to a slow USB drive can lead to an interface freeze and data loss. If you still decide, you will need to activate the debugging mode on USB. To do this, go to the Settings. → About the phone and quickly press 7 times on the item "Version" MIUI".
Once you activate the developer menu (appears in the "More"), find "Download from external drives" or similar in name (names may vary in different versions of MIUI). Activating this setting will allow the system to see the flash drive as a potential place to install applications. However, even with this enabled, many modern applications (bank clients, instant messengers) will still require installation exclusively in internal memory for security reasons.
⚠️ Note: If you format a flash drive as internal memory, it will be encrypted and cannot be read on another device (PC or other phone) without a complete reset.
A safer alternative is to manually change the way the data is stored in the applications themselves, for example, in the camera settings, you can specify saving photos and videos immediately on the app. USB-In messengers like Telegram or WhatsApp, you can also specify the path to the external map in the storage settings, which will significantly save space in the main section.
Possible problems and ways to solve them
Despite the simplicity of the technology, users may face a number of common problems, the most common being a message "USB-The device is not supported" or "Power consumption is too high. "This means that the smartphone's power controller cannot produce enough current to operate the connected flash drive, especially if it is an energy-intensive external hard drive (HDD).
In the case of hard drives, the solution is one: using active drives. USB-The flash drives, on the other hand, are usually low-powered, and they're more likely to be related to the file system or to damage to contacts. If the phone can't see the flash drive, try the next steps:
- 🔄 Reconnect: Remove and insert the plug again, making sure it has reached the stop.
- Clean Contact Cleansing: Wipe the Type-C connector and flash drive plug with dry soft cloth or alcohol.
- 💾 Formatting: Try formatting the drive into FAT32 computer-based.
Another problem may be slow copy speed, which is common with cheap adapters that don't match the specifications, and speeds can drop if the flash drive is fragmented or has a low write rate, in which case a full cleanup of the drive and re-formatting will help.
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If no flash drive is detected on your Redmi 9, it may be the charging port itself or the OTG controller on the motherboard has burned, in which case a diagnosis is required at the service center.
Safe extraction and maintenance of the port
The right termination of the external drive is the key to the longevity of your data. Unlike computers where it is customary to simply pull the USB drive, on Android smartphones, it is recommended to use software extraction, which ensures that all the recording buffers are cleaned and no file is damaged at the time of the contact break.
For safe extraction:
- Lower the notification curtain.
- Find the connected icon USB-device.
- Click on the "Secure Removal" or "Secure Removal" button.
- Wait for the notification to disappear and only after that physically remove the flash drive.
The USB Type-C port on Redmi 9 is a vulnerable design element. Frequently connecting and disabling adapters can lead to loosening of the connector or getting dust and pile inside. It is recommended to use adapters with a tight fit, but without excessive effort. It is also useful to periodically clean the port gently with a wooden toothpick or antistatic brush, removing accumulated dust.