Xiaomi Redmi 9 is one of the most popular budget smartphones that supports memory expansion with microSD cards. However, many users have questions about where the slot is located, how to insert the card correctly so as not to damage contacts, and what nuances to consider when you first connect. In this article, we will discuss the process from A to Z - from choosing a memory card to setting up its use in the system.
The feature of the Redmi 9 (as well as other models of the series) is that the slot for the memory card is combined with a tray for the memory card. SIM-So that means you have to take out the tray, and then you have to carefully install the microSD along with the microSD. SIM Or instead, depending on the configuration, we'll show you how to do this without the risk of damaging the device, and we'll also show you which memory cards are best for this model.
1 What memory cards support Xiaomi Redmi 9
Before buying a microSD, it is important to make sure that it is compatible with your smartphone. Xiaomi Redmi 9 officially supports microSDXC memory cards up to 512 GB (although the documentation sometimes specifies a maximum of 256 GB – in practice, more capacious models work).
- 🔹 Speed class: optimally choose cards with markings UHS-I (U1 or U3) Cards with a class below (such as Class 4) will work slowly, especially when recording video in the video. 4K.
- 🔹 File system format: for cards up to 32 GB FAT32, 64GB – exFAT. The smartphone will automatically determine the format, but if the card is not readable, it may need to be formatted.
- 🔹 Brands: Recommended cards from SanDisk, Samsung EVO, Kingston or Transcend – they are less forged and more stable with Xiaomi.
Important: some users are faced with the fact that the smartphone “does not see” a memory card with a capacity of more than 256 GB. This is due to the limitations of the MIUI firmware, in which case it will help to update the system to the latest version or manual formatting the card in exFAT via a computer.
⚠️ Warning: Don't buy memory cards with your hands or in untested stores! Fake microSDs (especially oversized "Chinese" ones) not only work slowly, but can also lead to data loss. H2testw after-purchase.
2.Where is the memory card slot in Redmi 9
In Xiaomi Redmi 9 slot for memory card is combined with a tray for SIM-The cart is located on the left end of the case (if you look at the screen with the front side), and the tray has a hybrid design: it can be installed either two nano-SIMs or one nano-SIM. + MicroSD: This means that if you use two SIM-cards, then the memory card will not work — you have to choose one thing.
To remove the tray, you will need a paper clip or a special key for SIM-tray (complete with smartphone) The extraction hole is located next to the slot and has a small diameter - don't try to use a needle or toothpick to avoid damaging the mechanism.
| Modification of Redmi 9 | Slot type | Max, the volume of microSD | Support for two SIMs + microSDs |
|---|---|---|---|
| Redmi 9 (standard) | Hybrid (2 nano-SIM or 1 nano-SIM + microSD) | 512 GB* | ❌ No. |
| Redmi 9A | MicroSD slot + 2 nano-SIM | 512GB | ✅ Yes. |
| Redmi 9C/9T | Hybrid | 512 GB* | ❌ No. |
*A maximum of 256 GB is officially stated, but testing shows work with cards up to 512 GB.
3. Step-by-step instruction: how to insert a memory card
Now, to the process itself, follow the instructions carefully to avoid damaging the contacts or jamming the tray.
☑️ Preparation for microSD installation
- Turn off your smartphone (optional). Although the Xiaomi Redmi 9 supports hot memory card replacement, it is better to turn off the device for the first installation - this will reduce the risk of failures during initialization.
- Find a hole to remove the tray on the left end and carefully insert the clip before clicking. The tray should extend 1-2 mm - pull it with your fingers to the end.
- Look at the tray, and it's usually a diagram showing you how to install the SIM and the microSD, and the memory card should be down, and the bevelled angle should match the shape of the slot.
- If you use one of them SIM-map + microSD, install nano-SIM in the first slot (usually signed as SIM 1), and the memory card in the second. SIM, The microSD cannot be inserted.
- Carefully insert the tray back into the smartphone before the click. Make sure it sits straight - if the tray is skewed, remove it and try again.
Once the smartphone is turned on, MIUI should automatically identify the memory card and prompt it to be formatted (if it is new). If this does not happen, go to Settings → Storage → Memory Map and select Format.
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If the card is not identified, try inserting it into another smartphone or computer, if it is not readable, there is a problem in the card itself, if it is readable, check if you have correctly installed it in the Redmi 9 tray (sometimes helps to flip the card on the other side).
4. Set up a memory card in MIUI
Once you have a microSD, you can choose whether to use it as a portable storage device or as internal memory.
- 📁 Portable storage: The card will be used as a removable drive (like a flash drive), you can transfer files manually to it, but the applications will be installed in internal memory by default.
- 📱 Internal memory: the card will become part of the system (encrypted and formatted), which will allow you to install applications directly on it, but after retrieving the card, the data will not be available on other devices.
For most users, the first option is portable storage, the second is only suitable if you critically lack space for applications. Note: if you choose the option of internal memory, the card can not be removed without data loss!
To change the settings later:
- Go to Settings. → Warehouse.
- Tap by the name of the memory card (for example, SD-map).
- Select Settings → Format as internal memory (or vice versa if you want to return port mode).
⚠️ Note: If you format the card as internal memory, MIUI I'll suggest you transfer the data from the main drive to it, and this process can take 10 to 30 minutes, and you can't interrupt it, and you can also note that once you format the map, you can't read it on a computer without special utilities.
Frequent problems and their solutions
Even with the correct installation of the memory card, there can be failures. Let's consider the most common situations and ways to fix them:
| Problem. | Possible cause | Decision |
|---|---|---|
| Map not determined | Incorrect installation, contamination of contacts | Remove the tray, check the orientation of the map, wipe the contacts with a dry napkin. |
| The map is defined but not formatted | Incompatible file system or card corruption | Format the card on your computer in FAT32 or exFAT, then try again. |
| The smartphone says, "The map is damaged." | Logical errors on the map or physical wear | Try to recover data using chkdsk (Windows) or replace the card |
| Applications are not installed on the map | The card is formatted as a portable storage | Reconfigure it as an internal memory (see section 4) |
If neither of these methods worked, try testing the card on another device, and if it doesn't work there, it's likely that the card has failed. In rare cases, the problem may be in the Redmi 9 slot itself (for example, after a smartphone crash), in which case you will need to be diagnosed at the service center.
What if the tray is jammed?
6. How to transfer data to a memory card
Once you've successfully installed the map, you can transfer photos, videos and other files to it, and you can do this in a number of ways:
- 📲 Through the file manager MIUI: Open the Files app. Select the files you want to transfer (for example, in a folder). DCIM for photo. Press highlight → Move it → Memory map.
Through the computer
MTP
Automatically.
Settings → Storage
For convenience, we recommend creating folders on the map by category (for example, Photos, Videos, Documents), which will make it easier to find files in the future, and remember to periodically check the free space on the map - if it runs out, the smartphone may start to slow down.
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Don't store critical data on a memory card without a backup! MicroSDs are more vulnerable to damage than a smartphone's built-in memory. Regularly copy important files to your computer or to the cloud.
7.Memory card care tips
To make microSD last longer, follow these guidelines:
- 🚫 Do not remove the card while writing or reading data (for example, copying files or shooting videos) This can damage the file system.
- 🧼 Regularly clean the contacts of the card and the slot of the smartphone from dust with a soft brush or dry wipe!
- 🔋 Avoid overheating: Do not leave your smartphone with a map in direct sunlight (for example, on a car torpedo).
- 📉 Don't fill in the card "on the hook." Leave at least 10% of the free space, this will prolong its life.
If the problem repeats with a new card, the slot in the smartphone may be faulty.