Owners of the popular Xiaomi Redmi 9 smartphone often face a critical shortage of free space in the internal drive. Built-in memory of 32 or 64 gigabytes fills up instantly after installing messengers, social networks and navigators. MIUI system is known for its aggressive policy of resource management, which makes freeing up space a priority for comfortable operation.
Fortunately, Redmi 9 supports microSD card installation, which allows you to significantly expand the storage capabilities. However, the standard procedure for porting programs here has its own nuances, different from stock Android.
In this guide, we will take a look at all available storage optimization methods, learn how to move cache, photos and applications using embedded tools or third-party utilities, and avoid errors that can lead to data loss or unstable device operation.
Preparation of memory card and smartphone for work
Before you start transferring data, you need to make sure that the memory card used is compatible and serviceable. Xiaomi Redmi 9 supports microSDHC and microSDXC cards up to 512 GB. Using low-quality or fake cards can lead to loss of information and slow down the entire system.
It is recommended to use a Class 10 or higher speed drive, such as the UHS-I standard, which will provide sufficient read and write speeds necessary for modern applications. If the card has been used before in other devices, it is better to format it directly in the smartphone.
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Before formatting, be sure to copy all important files from the memory card to the computer, as in the process all data will be irretrievably deleted.
For formatting, go to the Settings menu → The phone. → Storage. Here you'll see a list of connected drives. Select yours. SD-Click the Format button and the system will warn you of the risks, then create a new file structure that is optimized for working with the system. MIUI.
Analyzing the current memory state of the device
You can't manage space effectively without understanding what's taking up space, and there's a powerful monitoring tool built into the MIUI shell that shows you how files are categorized, and it can identify memory eaters that often go unnoticed.
Notice the Apps section. This is where heavy games and social media are stored. Often the size of the app on the list can be small, but its cache and downloaded files take up gigabytes. Cache data is a temporary file that speeds up programs, but can be safely deleted or moved.
| Type of data | Where it's stored | Can we move it? | Recommendation |
|---|---|---|---|
| System files | Internal memory. | No. | Don't touch it. |
| Installed annexes | Internal memory. | Partially. | Use it. SD-map |
| Photos and videos | Internal/SD | Yes. | Move it first |
| Cash app. | Internal memory. | Yeah (tune) | Regular cleaning |
Also worth checking is the Download folder and messenger directories like WhatsApp or Telegram, which often store all the media they receive into internal memory by default, and changing these settings within the apps themselves is the first step to freeing up space.
MIUI built-in tools for data transfer
The MIUI shell provides the basic functionality to move user content, and it's the safest way to do that without having to install any additional software, but it's important to understand that system constraints don't allow you to migrate all applications.
To move media files, use a standard explorer. Go to Files, select documents, images or videos you want. Click More and select Move. As your target directory, select yours. SD-This method frees up a significant amount of internal memory.
☑️ Pre-transfer check
As for the applications themselves, in the settings of the Application → All applications can be found on the "Move to" button. SD-This button is only active for programs whose developers have authorized external drive installation. For most system services and mission-critical applications, this option will not be available (blackened).
Use of the “Memory” function in settings
Newer versions of Xiaomi firmware have a dedicated memory management section that allows you to automatically move some types of data. → Memory and activate the use option SD-Default cards for new files.
You can also find cleaning tips here, and it will analyze the rarely used applications and suggest that they be removed or moved, and it's a handy tool for lazy users who want to keep things in order without going deep into the file system settings.
⚠️ Note: After transferring applications to SD-The speed of their launch may decrease, especially if you use an old-format drive.
If the built-in tools can not move the desired application, you should turn to proven third-party solutions. They allow you to bypass some of the limitations of the Android operation, although they require a more careful attitude to access rights.
Applying App2SD to expand capabilities
One of the most popular memory tools on Xiaomi is the App2SD app, which allows you to analyze in detail which programs can be moved and which can not. The utility divides applications into three categories: on the phone, on the map and those that can be moved.
You don't need root rights to work with an application, but you have limited functionality without them, you can only move applications that allow you to do this at the system level. However, App2SD provides a user-friendly interface for mass transfer, which is often lacking in the standard MIUI menu.
What is Link2SD Mode?
Once installed, run a scan. The program will show you a list of installed software, select the right games or utilities and press the move button. The process can take several minutes depending on the size of the application and the speed of the memory card.
Transfer of media files to Telegram and WhatsApp
Messengers take up the lion's share of memory for most users, and WhatsApp and Telegram can change the way they store their files, and it won't take the app itself, but it will free up gigabytes in internal storage.
On WhatsApp, go to Settings → Chats → Storage. You can set up Wi-Fi-only media autoloads and clear your cache. To fully transfer your correspondence history to your memory card, you will need to use Backup in your chat settings by selecting Google Drive, and then manually move your Media folders through your file manager.
Telegram has a simpler situation: Settings → Data and memory → Memory use. You can clear the cache with a single click. Moreover, Telegram stores all photos and videos in the cloud, so they don't need local storage. Just turn off the gallery save, and the phone's memory will no longer fill up with copies of the images viewed.
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Regular cleaning of the messenger cache is more effective than transferring system applications and safer for the stability of the smartphone.
Problems and limitations in working with SD-card
Despite all efforts, users may face a number of limitations, including the inability to fully run some applications from an external drive, due to changes in Android security policies starting with version 6.0 and up.
When you transfer to a memory card, the application may stop updating through Google Play or work unstable when you remove the card. Also, it is worth considering that the microSD speed is always lower than the speed of internal flash memory of the Xiaomi Redmi 9 smartphone.
⚠️ Note: If you remove the memory card, all the applications transferred to it will stop working and disappear from the installed list.
In some cases, the system may request re-authorization of applications after they have moved, which is normal behavior, involving changing the path to configuration files. Just log in again.