Owning a modern smartphone like the Xiaomi Redmi 9 involves taking advantage of multimedia capabilities that require a significant amount of space. Built-in 32 or 64 gigabytes can quickly run out if you like to shoot high-resolution video or install heavy games, at which point the user is faced with the question of expanding storage with an external drive.
The process of installing a microSD card in this device does not require special technical skills or expensive equipment, but has its own nuances, ignoring which can damage the tray or the flash card itself. It is important to understand that the slot in this model is combined, which imposes certain restrictions on the simultaneous use of two SIM cards and a memory card. In this article, we will discuss the entire process in detail, from choosing the right format of the drive to configuring the system for proper operation.
Before you start physically removing the tray, you need to prepare the workplace and make sure that all the necessary tools are available. Redmi 9 is equipped with moisture protection, so the tightness of the case plays an important role, and careless actions can violate the integrity of the seals. We will look at safe extraction methods that ensure the safety of your device in its original form.
Choosing the right memory card for Redmi 9
The first step to successful memory expansion is to purchase a compatible drive that will work consistently with the controller of your smartphone. Xiaomi Redmi 9 supports cards format microSDHC and microSDXC up to 512 gigabytes, although many users successfully use more capacious models.
When buying, pay attention to the speed class, labeled as Class 10, U1 or U3, as this parameter depends on the speed of reading data and recording video. If you plan to store an application on a flash drive or shoot 4K video, the savings in the speed class will lead to constant delays and friezes in the system. For ordinary storage of photos, music and documents, budget options with minimal requirements are quite suitable.
💡
Buy memory cards only from trusted stores, as the market is oversaturated with fakes that lose data after months of use.
There's also the notion of a form factor, and in this case, we want a reduced microSD option, not a full-size SD that's used in cameras. Often, there's an adapter bundled with the card, but it's just for connecting to a computer and not inserting into the phone. Make sure there's no visible defects, chips or contact oxidation on the card case.
Preparation of the device and removal of the tray
Before any manipulation of the hardware of the smartphone is strongly recommended to completely turn off the device to avoid short circuit or software errors in determining new equipment. Although modern systems are able to detect hot connection, the risk of damage to the file system or power controller when the phone is turned on, there is still a risk, especially if the contact is not established the first time.
Find on the lower end of the case Redmi 9 oblong tray, which has already installed one of the SIM-Near the tray hole, you'll see a small circular hole designed for a key-clip that comes with a set or a regular paper clip with a thin sting. Carefully but confidently press the tool into the center of the hole perpendicular to the body until the tray jumps and exits the groove.
☑️ Preparation for map installation
After removing the tray, carefully examine its design, as in Xiaomi Redmi 9 it has a specific form of "sandwich" or combined type. On one side of the tray there is a notch under nano-SIM, and on the other - a platform for microSD, and they can be located on different levels or sides depending on the revision.
Proper installation of microSD in a combined slot
The most critical point of the instruction is the correct orientation of the card in the tray, since the force is not the assistant here, and if the card does not enter easily, then you hold it wrong. In the Redmi 9 combined slot, the memory card is usually mounted on the inside of the tray, pressing against the plastic base, while the memory card is usually mounted on the inside of the tray. SIM-The contact in golden color on the memory card should look down to the contacts of the phone, and the bevel of the card should coincide with the bevel in the bed of the tray.
Carefully place the card in the designated area, making sure it fits tightly to the plastic base and doesn't stagger. SIM-You can install a microSD in the second slot, freeing up space for the second SIM, or use a hybrid mode. SIM-The cards and memory cards in this particular slot are not possible due to the physical limitations of the design.
What to do if the card is not fixed?
Once the card is installed, gently push the tray back into the phone body, making sure it enters smoothly and without skewing. The tray should enter before clicking or completely drowning into the body, ensuring tightness. If you feel resistance, do not push, take out the tray and try again, checking for correct orientation.
Primary configuration and formatting of the drive
Once the smartphone is turned on, MIUI will automatically detect a new storage device and give a notification at the top of the screen. You will be asked to configure the map, and it is important to choose the correct mode of use depending on your needs: as a portable storage or as part of internal memory. Selecting Portable Storage mode will make it easy to transfer data to other devices, but applications will not be on the map.
If you choose to use the card as an extension of internal memory (Adoptable Storage feature), the system will suggest formatting it, completely clearing all data. This process will create a secure partition that is only available for that particular phone, and transfer data to another PC without unlocking will not work. Formatting is a mandatory procedure for creating the correct file system that is compatible with Android.
⚠️ Note: The formatting process will permanently delete all files on the memory card, so pre-copy important data to your computer.
To access advanced settings, go to Settings → About Phone → Storage, where you can manage files and see the amount of space occupied. This section shows detailed statistics of space usage by various applications and system files. Here you can force formatting to start if an automatic notification does not appear.
Transfer applications and files to an external map
Once set up successfully, the main issue is to transfer the accumulated content to free up precious internal space of the system. Photos and videos can be transferred through the standard File Explorer by simply selecting a folder. DCIM/Camera in internal memory and moving its contents to a similar folder on SD-This action will not only free up space, but also protect your pictures in case your phone resets.
Application portability is more complicated, as not all applications support external storage for security and performance reasons. → Annexes → Manage applications, select the desired program and click on the memory button, and then "Change." If the button is inactive, then the developer has banned the transfer, and you can't get around this without root rights.
| Type of data | Can we move it? | Recommended method | Impact on speed |
|---|---|---|---|
| Photos and videos | Yes. | Conductor/Gallery | Minimum |
| Music and Documents | Yes. | Conductor | Absent. |
| Annexes (Games) | Partially. | Application settings | Possible FPS reduction |
| System files | No. | Unavailable | Not applicable. |
💡
Transferring heavy games to a memory card can increase load times, as microSD read speeds are usually lower than UFS internal memory speeds.
Possible problems and ways to solve them
Despite the simplicity of the procedure, users may encounter a situation where the phone does not see the memory card or gives a formatting error, most often the problem lies in oxidized contacts of the card itself or contamination of contacts inside the phone slot, which is solved by careful cleaning with an alcohol wipe.
If the system writes "damaged" or requires re-formatting, try checking the card on your computer using a chkdsk utility or specialized programs like SD Formatter. Sometimes it helps to repeat the installation procedure: turn off the phone, remove the card, wipe the contacts and insert again, making sure that the tight fit. In rare cases, the problem may be a software failure of the MIUI firmware, which is solved by updating the system to the latest version.
It is important to note that cheap memory cards of unknown brands can quickly fail or lose data, so if you constantly read errors, you should think about replacing the drive with a better one.
Safe extraction and maintenance
To avoid data loss and file system damage, never remove the memory card while the phone is on and writing or reading. Android has a secure extraction feature that closes all active processes with the drive before it is physically disabled. You can find this option by Settings → Storage → (Card Selection) → → →
Once the card is safely retrieved, you can keep the phone on, but it's best to keep it safe, especially if you plan to keep the tray open for a long time, carefully remove the tray, pull the card out and put it away in a secure place, away from magnetic fields, moisture and extreme temperatures, regularly check the integrity of the data, backing up important information to the cloud services or your computer.
⚠️ Warning: Never pull the tray with your fingers or nails if it is stuck - this can lead to breakage of the mechanism or damage to the body of the smartphone.
Regular maintenance includes checking free space and deleting unnecessary files, as a crowded memory card can slow down the entire device. 10-15% The following simple rules will prolong the life of both your memory card and the Xiaomi Redmi smartphone. 9.