Xiaomi Redmi 9 is a popular device that is often chosen for the optimal ratio of price and performance. However, built-in storage of 32 or 64 gigabytes may not be enough for active users who like to shoot high-resolution video or install heavy games. It is at this point that the owner faces the question of expanding physical memory with a flash card. In this article, we will discuss in detail the process of installation, configuration and troubleshooting problems that can occur when working with an external drive.
The procedure for adding additional storage seems trivial, but in modern monolithic cases it has its own nuances, especially regarding the design of the tray. Installation can lead to the fact that the device will not see the media or, in the worst case, damage contacts. We will look at how to avoid typical errors, what map format Redmi 9 supports and how to correctly transfer data to a new volume. It is important to understand that the correct handling of the file system will prolong the life of your data.
Preparation for installation: selection of compatible memory card
Before you physically interfere with the design of the smartphone, you need to make sure that you have purchased the right type of media. Xiaomi Redmi 9 is equipped with a hybrid slot, which means the ability to install either two or more devices. SIM-card SIM-Support for memory cards is limited to microSDHC and microSDXC, and the maximum officially supported volume can reach 512 gigabytes, although in practice, more cards are often used.
Write and read speed is critical, especially if you plan to store apps on a flash drive or shoot videos. Class 10, UHS-I or higher cards are recommended. Using slow cards can lead to slow interfaces and a long gallery opening. Note the A1 or A2 markings, which indicate optimization for working with applications.
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Buy memory cards only from official stores or trusted partners, as the market is saturated with fakes that lose data without the possibility of recovery.
Also, you should prepare the tool to remove the tray in advance. The Redmi 9 usually comes with a special clip, but if it is lost, you can use a regular stationery clip, straight-up, or a thin needle. The main thing is to make sure that the tip of the tool is not too thick so as not to damage the latch mechanism inside the case.
Slot location and tray extraction
The SIM card slot and memory card in the Redmi 9 model is located on the lower end of the device, to the left of the USB Type-C charging connector. The tray is designed to minimize dust, but at the same time provide easy access. To start working, the phone must be turned down the screen, placing on a soft, clean surface to avoid scratches on the display or back cover.
Take a close look at the end of the smartphone, and you'll see a small circular hole next to the elongated tray, and that's where you put the tool in. Don't use excessive force: the opening mechanism works by pressing the inner spring, not by pulling rough. If the tray doesn't respond, check the angle of the tool, it has to be strictly perpendicular to the body.
What to do if the tray is stuck?
Once you've successfully extracted it, you'll see that the tray is shaped to fit the components in a specific order, and on one side, it's usually a memory card, and on the other, it's a memory card. SIM-The card, or they can be placed on different sides depending on the revision of the device.
Proper installation of microSD card in tray
The most critical thing is to physically place the card in the tray. The Redmi 9 tray often has cutouts of different shapes for SIM and microSD, which eliminates the wrong installation, if you look at it carefully. The microSD card should lie in its recess tightly, without backlashes. The golden contacts on the map should be directed downwards, to the inside of the tray, if you look at it from the notch side.
Notice the bevel of one of the corners of the memory card, which is the bevel that matches the cutout in the metal tray, and if the card doesn't lie flat and protrudes above the edges, you're trying to insert it on the wrong side or in the wrong compartment. You're not trying to force the card in, because it could break the plastic guides or damage the card itself.
☑️ Pre-installing check
Once the map has taken its place, carefully insert the tray back into the phone case. Watch for orientation: the tray should only enter in one position. If you feel resistance, don't push, take out the tray, turn it 180 degrees and try again. A properly installed tray should equal the frame of the case without gaps.
Primary configuration and formatting in MIUI
After switching on the smartphone system MIUI, The Redmi 9 should automatically detect the new drive, and the screen will show a notification that a new drive has been discovered. SD-The system will offer several uses: set up as a portable storage or as an internal storage.
If you choose portable storage mode, the card will be used to store photos, videos, music and documents, which is the most secure and common option, in which you can easily extract the card and connect it to your computer through the card reader without losing data, formatting in this case will create a file system that is compatible with most devices.
There's also the ability to combine memory, turn the card into an internal storage, and if you choose to do this, all the data on the card will be permanently deleted, and the card will be encrypted and linked to a particular phone, which means that you can't just move this card to another phone and read the data, and the system speed can decrease if the memory card is slower than the built-in module.
| Parameter | Portable storage | Internal storage |
|---|---|---|
| Use of the | Photos, videos, music | Applications, games, data |
| Portability | You can move it to a PC/other phone. | It only works on this phone. |
| Security | Data available after extraction | Data encrypted |
| Speed. | Depends on the card. | Could slow down the system. |
Application Transfer and File Management
After successful installation and formatting, many users want to migrate applications to a memory card to free up the main space. In Xiaomi Redmi 9 with the MIUI shell, this feature is not available for all applications. Android developers have limited the ability to fully install programs on external drives for security and stability.
To migrate supported applications, you need to go to settings. → Annexes → All applications. Select the desired application from the list. If the program supports portability, the memory button will be active, and you will see the option "Change" or "Move to" SD-If there is no such option, then the application is critical to the system or the developer has banned it from moving.
To manage files, photos and downloads, the best way to use a standard File Explorer is to see two sections: Device Memory and «SD-By moving files manually, you can organize a convenient folder structure, such as creating separate directories for working documents and multimedia, so you don't get confused by a huge amount of data.
Safe extraction and possible problems
One common mistake is to physically remove the memory card without first having to be software-based shut down.This can damage the file system and cause data loss. In Redmi 9, the process of safely extracting the memory card takes a few seconds and ensures that your files are safe.
To retrieve the card, go to Settings. → The phone. → Storage (the path may vary slightly in different versions) MIUI). Find yours. SD-a card in the list and click "Disable" or "Safe Retrieval" button. Only after the corresponding notification appears in the status curtain can the tray be physically removed from the device.
⚠️ Warning: Never remove a memory card while recording data (e.g. while shooting a video or installing an app) this is guaranteed to result in read errors and possible loss of last saved files.
If the phone has stopped seeing the card or it is not working correctly, try to clean the contacts of the card with a soft eraser or an alcohol wipe. It is also worth checking the card on the computer with utilities to test the speed and integrity of sectors. Sometimes the problem lies not in the phone, but in a poor medium.
⚠️ Note: If the system constantly suggests formatting the card, even though it has important data, do not agree immediately. Try to copy the data to the PC through the card reader.