Xiaomi Redmi 9 is a popular device that is often chosen for its balance between price and performance. However, one of the frequent problems owners have is fast filling internal memory, especially if you like to shoot high-resolution video or install a lot of heavy applications. When the storage is crowded, the system starts to run slower, and new photos simply stop saving.
Unlike some other Android shells, MIUI has its own external drive features. You can't just move your gallery system folder with a single click, as is sometimes the case on pure Android. The file system requires the right approach to organizing data so that media files are displayed correctly and not lost in crashes. In this article, we'll look at all the available methods, from standard camera settings to manually moving files through the file manager.
Freeing up internal space not only solves the problem of space shortage, but also prolongs the life of your device, and when the internal flash memory is filled to the fullest, the speed of writing and reading data decreases, which directly affects the speed of the interface. Properly configured storage of media files on SD-The card allows you to use the internal resource only for system processes and applications, which is the optimal strategy for the operation of the smartphone.
Preparation of SD-card for work in the MIUI system
Before you start transferring data, you need to make sure that your memory card is properly installed and formatted. Xiaomi Redmi 9 supports microSD cards up to 512 GB, although many users successfully use more capacious drives. It is important to understand that for stable operation it is better to use cards of class speeds at least 10 or UHS-I, otherwise when shooting video in 4K or Full HD, you can experience delays or frame omissions.
Once the card is physically installed in the SIM card tray, the system will automatically prompt it to be set up. If that doesn't happen, you need to go to the settings menu. Find Settings → Phone → Storage or just Settings → Memory depending on the firmware version. Here you'll see a list of available drives. If the card is new, the system may require formatting. Formatting will completely delete all data from the card, so be sure to save important files on your computer before starting the procedure.
In the formatting process, MIUI will offer two uses: as a portable storage device or as part of internal memory. For our task, which is to transfer the gallery, we'd better choose Portable storage, which will allow you to easily retrieve the card and connect it to other devices, such as a computer or TV, without losing data. Internal memory mode encrypts the card for a particular phone, and you can't read it on another device.
⚠️ Note: Do not remove the memory card while recording videos or saving photos.This can lead to file corruption or, in the worst case, logical errors of the file system, requiring re-formatting.
Once formatted successfully, the system will name the card, for example, an SD Card or a MicrosoftSD. Make sure it displays correctly in the File Manager and has enough free space. Now that the foundation is laid, you can move to direct media management.
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Use memory cards from trusted brands (SanDisk, Samsung, Kingston). Cheap cards from marketplaces often have real capacity declared and quickly fail when actively recording.
Setup of automatic photo and video saving
The easiest way to prevent internal memory overflow is to set the camera up to save new images to an external drive immediately. In Xiaomi’s standard Camera app, this feature is quite convenient, but it needs to be activated manually. By default, the smartphone continues to write everything to the internal drive.
To change your settings, open the Camera app and click on the three horizontal bars in the upper right corner of the screen. From the menu that appears, select Settings. Scroll down to the Additional Settings section or immediately look for Save to Save to the Settings section. SD-Activate the switch opposite this point, and then all the new photos and videos will automatically be sent to the folder. DCIM/Camera on your memory card.
It's worth noting that some shooting modes may ignore this setting, such as the video mode. 4K», «Slow-motion or Timelapse sometimes continue to store files in internal memory due to the requirements for high write speeds that are required by the system. SD-This is normal behavior of the system to prevent data loss.
If you use third-party camera apps like Open Camera or GCam, you should look for settings inside these apps. → Conservation settings → The save path. You can manually specify the folder here. SD-map to fully automate the process.
Manual transfer of existing photos and videos
Set up future shooting is great, but what about the thousands of photos that have already been accumulated? To transfer an existing gallery to a memory card, Redmi 9 has a standard and very powerful tool called File Manager, which allows you to move files en masse, preserving the folder structure.
Open the Explorer app on your desktop. You'll see the top bar with categories (Images, Videos, Documents). Click on Images to see all photos. To highlight all files at once, click and hold your finger on one photo until the tick appears, and then select "Select All" in the bottom menu or through the three-dot menu. After highlighting, click Move.
The system will suggest you to select a destination. From the list of available storage, select your destination. SD-It's recommended to create a separate folder there, for example, «Archive_Photos_2023», To avoid mixing old and new files, click "Put in" or "OK." The copying process will take time depending on the data volume and speed of the card.
☑️ Checklist for file transfer
You can do the same thing with video files. They often take up the most space. In Explorer, go to the video category, select the files and move them to the appropriate folder on the external drive. After you move the gallery of the smartphone can index new paths to the files for a while, so immediately after the operation, the photos may not appear in the preview — just wait a few minutes.
Working with folders of messengers and social networks
Not only personal images, but also messaging media files, WhatsApp, Telegram, Viber and social media stores thousands of images and videos that are often duplicated, and can and should be transferred manually to a memory card, as they are not usually automatically ported.
In the standard Explorer, go to the internal memory. Find folders with the names of messengers.
- 📁 WhatsApp: WhatsApp folder → Media → WhatsApp Images and WhatsApp Video.
- 📁 Telegram: Telegram folder → Telegram Video or Telegram Images.
- 📁 Viber: folder Viber → Media.
Select the contents of these folders and move them to SD-You can create a folder structure there «Messengers/WhatsApp», keep order.
An important nuance: Once the files are transferred, messengers may stop displaying them in their internal galleries, as they will lose their way to the files. However, the files themselves will remain intact on the memory card, and you can view them through a standard MIUI Gallery or Explorer. This is a great way to create an archive of correspondence without taking up space in the phone.
⚠️ Note: Before transferring messenger folders, make sure you have a backup of important documents. Moving system files inside application folders (not media, but configs) can disrupt their operation.
Why do messengers fill up memory again?
Cleaning gallery cache and optimization
After mass file transfer, you may experience a situation where the gallery displays "broken" previews or duplicates of deleted photos, because the Media Storage database did not update instantly, and to fix this, you need to clear the cache of system services.
Go to Settings → Apps → All Apps. Search for “Gallery” or “Media.” You need to find the Gallery system app and possibly Media Storage. Click on it, select Memory and click on Clear Cache. Don’t confuse “Clear All Data” with “Clear All Data” — it will reset the settings of the gallery itself, but it won’t delete your photos, but you’d better limit yourself to cache.
Once the cache is cleared, restart the smartphone. When turned on, the system will scan the storage. At this point, the phone may warm slightly - this is a normal process of indexing new paths to files on the computer. SD-through the map. 5-10 The gallery should display the current state of the files.
| Action. | Impact on memory | Recommendation |
|---|---|---|
| Porting photos to SD | High (releases GB) | Do it regularly, once a month |
| Clearing the cache | Low (hundreds of MB) | After the file transfer |
| Removal of duplicates | Average. | Use the "Security" application |
| Compression photo | Average. | For archival, non-important photos |
The Xiaomi Redmi 9 also has a built-in Security app, which has a Cleanup section, and it will find large files, duplicates and unused apps on its own, which is a good way to do a final revision after manual transfer.
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Regular cleaning of cache and transfer of media files to SD-The card is the only way to keep the Redmi 9 running fast in the long run without buying a new device.
Possible problems and ways to solve them
Despite the simplicity of the procedure, users can encounter a number of difficulties, one of the most common is the “file too big” error when transferring videos, which occurs if the card is formatted in the FAT32 file system, which does not support files larger than 4 GB. The solution is to format the card in exFAT format (via computer or phone, if there is an option).
Another problem is the slow map, and if you move the gallery, the phone starts thinking long and hard when you open the photo, you're reading faster. SD-The map is not enough for the interface MIUI. In this case, part of the frequently used photos is better left in internal memory, and only the archive is transferred to the map.
You also see a situation where the phone stops seeing the card after transferring a lot of data, which may indicate that the drive is overheated or low quality. Try restarting the device. If the problem recurs, check the card for errors through the computer, running a file system check.
⚠️ Warning: If your smartphone suddenly shuts down while you're transferring files, don't panic. Turn it on and check the integrity of the files. Some of the data may have been damaged. Always try to have a battery charge of at least 40% before mass copying.
Rarely. MIUI You may “lose” access to files. SD-If the gallery says "File not found," try rewiring the card in the memory settings or just restarting the phone.
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To diagnose your speed SD-Cards can be installed free application SD Card Test on Google Play, which will show real speed of reading and writing, which will help to understand whether the card is suitable for storing high-resolution video.
Final recommendations for memory maintenance
Memory management in Xiaomi Redmi 9 is not a one-time action, but a process. To ensure that your smartphone always flies, make it a rule to check the storage capacity once a month. Modern cloud services such as Google Photos or Yandex.Disk can serve as a great addition to a physical memory card, ensuring the safety of data even in the event of card loss.
Remember that SD-The cards have a limited rewrite resource, and you should not use them as the main place to install applications (if this is possible at all), as this will quickly disable the card. For photos and videos, they are perfect, as these files are recorded and read, but not deleted permanently.
Use gallery triage. Create favorites albums for frequently used photos so you don't search for them among the thousands of archived images on the map. Competent file management saves time and nerves.