Budget smartphone owners often face a shortage of free space to install new apps or save photos. The Redmi 9C, despite its popularity, can require storage expansion, especially the basic versions with 32 or 64 gigabytes of internal memory. Using a microSD card is the most affordable and effective way to solve this problem without buying a new device.
However, simply inserting a drive into a slot is not enough to work properly. The MIUI system installed on a smartphone has its own features of managing external media. To save application files, photos and documents on a flash drive, rather than overflowing the internal partition, you need to properly configure access rights and formatting. In this article, we will discuss all the nuances of working with external storage on your device.
If you don't set up correctly, you can make the phone see the card but refuse to write data to it, or you can make the system constantly require you to log in every time you turn on the screen, and you can avoid those mistakes and turn your budget smartphone into a multimedia center with a lot of memory.
Physical Attitude and Primary Recognition
The first step is to properly install the memory module into the device. 9C a combined tray, which means that two can be installed SIM-You need to use a special paper clip that comes with it to remove the tray from the bottom end of the case. Be extremely careful and do not make excessive efforts to avoid damaging the mechanism.
After removing the tray, notice its shape. On one side, the contacts for SIM cards are placed, and on the reverse or in a special notch (depending on the revision of the tray) there is a place under the microSD. The card should lie tight, with contacts down, and not protrude beyond the edges of the tray, otherwise there is a risk of damaging the contacts when inserted.
After turning on the smartphone, the system must automatically identify a new storage device, and a notification will appear on the screen that a new one has been discovered. SD-It's important not to ignore this message, because that's when the file system is first mounted. If there's no notification, check the integrity of the contacts on the card and in the phone slot.
⚠️ Warning: Never remove a memory card while the phone is on and writing data is in progress, which can cause permanent damage to the file system and loss of all information.
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Use memory cards of class speeds not lower than Class 10 or UHS-I. Slow cards will slow down the entire interface of the smartphone, as the system will wait for a response from the drive.
Formatting the drive through Android settings
Before you can access the full recording function, the card needs to be formatted. This action erases all data, so if there are important files on the flash drive, copy them to your computer in advance. To start the process, go to the Settings menu, then select About Phone or immediately find Advanced Settings (depending on the MIUI version, the path may vary slightly, but most often it is Settings → Storage).
In the storage section you will see information about internal memory and connected memory. SD-Click on the name of your card, and it offers two uses: portable storage or internal memory, and for simple photo and music storage, choose the former. If you want to migrate apps there, you’ll need a second mode known as Adoptable Storage.
The formatting process can take anywhere from a few seconds to a couple of minutes, depending on the size of the drive, during which time do not turn off the smartphone screen or run other heavy applications. Once completed, the system will give a message about the successful completion of the operation, and the card will be available for recording.
☑️ Preparation for formatting
Using the card as internal memory
The function of turning an external card into an internal drive is hidden in many versions of Xiaomi firmware, but it is critical for owners of models with a small amount of internal memory. This mode encrypts the card, making it unreadable on other devices without unlocking the key of a particular phone, thus giving you a single space for installing games and programs.
To activate this mode, you sometimes need to use special commands via a computer or third-party utility if the standard menu does not offer this option. However, in the pure versions of Android or through the developer menu, you can find a switch. Once activated, the system will prompt you to move data and applications. The speed of applications from such a card will be lower than from native memory, so choose only the lightest cards with a high speed rating.
Remember, when you reset your phone to factory settings, the data on that card will be lost or unavailable, and it's a security measure to prevent data theft when you lose your device, so back up important information to the cloud regularly.
⚠️ Note: Not all memory cards are suitable for internal memory, and cheap storage devices can quickly fail due to intense cyclical overwriting of system files.
What happens when you retrieve a card in internal memory mode?
Configure access rights and application permissions
Even after formatting, some apps may not see the card or refuse to save files to it. This is due to Android's security policy, which restricts access to external drives. To fix this, you need to manually issue permissions. Go to Settings → Apps → Application Management.
Find the application you want to use (such as a file manager, gallery or voice recorder) in the list. Go to Permissions. There should be a storage or memory item. Make sure that file access is allowed. In newer versions of Android, this can be called All Files or File Management.
For Xiaomi's File Manager system, access is usually open by default, but when you first start up, you may get a confirmation request. Click Allow or OK in the dialog box that appears. If you don't, you'll only see the system folders, but you won't be able to create new ones.
Solving problems with reading and writing
It's a common occurrence for a phone to see a card but not write anything to it, usually due to file system errors or physical wear and tear on the contacts. First, try rebooting the device. If that doesn't work, remove the card and wipe the contacts with a soft wipe or a napkin dipped in alcohol.
If the problem is software, you may need to re-format, but with the choice of another file system. the standard for Android is exFAT or FAT32. FAT32 has a limit on the size of one file (no more than 4 GB), so for video in 4K, it is better to choose exFAT if the phone supports this format.
Also check the card on another device, such as a computer. If the PC can't write files either or requires formatting, it may be physically damaged, in which case no smartphone settings will help, you will need to replace the drive.
| Problem. | Possible cause | Method of decision |
|---|---|---|
| Map not determined | Dirty contacts or software failure | Clearing contacts, rebooting |
| Recording error | FAT32 file system | Formatting in exFAT |
| Slow work | Low-speed card class | Replacement with Class 10/U3 card |
| Applications not portable | Internal memory mode is disabled | Activation of Adoptable Storage |
Optimization of the system with external memory
Optimization is recommended to ensure that the Redmi 9C works smoothly with the connected memory card. Periodically check the free space and delete unnecessary files. A crowded memory card can cause interface friezes and long-term application opening.
Use built-in cleaning tools. The Security app has a garbage cleaning feature that also analyzes the contents. SD-Do not ignore warnings about duplicate files or damaged thumbnails, deleting them will speed up the gallery.
Critical: Regularly back up important data from map to computer or to the cloud. External drives are less reliable than the built-in memory of a smartphone, and they have a higher risk of sudden failure.
⚠️ Warning: Avoid installing heavy games directly on the SD-This will lead to long loads of levels and possible dropouts of the application due to the low response rate of the drive.
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A properly formatted and high-quality memory card can significantly extend the life of a smartphone with a small amount of built-in storage, turning it into a full-fledged multimedia tool.