The Xiaomi Mi 9, launched in 2019, has long been the company’s flagship, offering users the cutting-edge features of the time. One of the key questions that owners and potential buyers of used devices face is the amount of space available to install applications and store files. Understanding the memory architecture of this device is critical for comfortable operation, since internal storage cannot be expanded with a microSD card.
In this article, we will discuss in detail how much RAM and internal memory are available in various model modifications, how the system allocates resources and why the user has less gigabytes than the manufacturer stated, and you will learn effective ways to optimize space and clean up cache, which is especially important for the Android shell MIUI.
Memory Types in Xiaomi Mi 9: RAM and ROM
When discussing the characteristics of any smartphone, including the Xiaomi Mi 9, it is necessary to clearly distinguish the two main types of memory: RAM (RAM) and permanent (ROM). RAM is used to temporarily store data running applications and processes of the system, ensuring the speed of the interface.
The Xiaomi Mi 9 uses the modern LPDDR4x standard for RAM, which provides high data transfer speeds and energy efficiency. For permanent storage, the UFS 2.1 standard is used, which is much faster than the common eMMC, allowing applications to load instantly and files to be copied without delay.
It is important to understand that the amount of memory available to the user is always less than the specified specifications, this is due to the fact that part of the system partition is reserved for Android operating system files and proprietary shell MIUI, as well as service data. In addition, manufacturers use a decimal system (1 GB = 1,000,000 bytes), while the operating system counts in binary (1 GB = 1,024 MB), which creates an additional visual difference.
- 📱 RAM (RAM: Responsible for multitasking and open application speed.
- 💾 ROM (ROM: Permanent storage for all user data and systems.
- ⚙️ System reserves: Part ROM Always busy with firmware files and not available to the user.
Modifications and storage volumes
Xiaomi has released the Mi 9 flagship in several configurations to meet the needs of different user groups. Globally and in China, versions with different amounts of RAM and internal memory were available. The choice of modification directly depends on how many applications you can keep in the background and how much media will fit on the device.
The base version often had 6GB of RAM and 128GB of permanent storage, which is enough internal storage for most users for everyday tasks, but avid photographers or gamers may need a more advanced configuration. Top versions offered increased RAM up to 8GB or even 12GB in the special version of the Transparent Edition.
⚠️ Warning: Make sure you buy the version you need, as the Xiaomi Mi 9 does not have a memory card slot.
Below is a table showing the main memory configurations that have been sold:
| Modifications | RAM (Ram) memory (RAM) | Integrated memory (ROM) | Type of storage |
|---|---|---|---|
| Basic | 6GB | 128GB | UFS 2.1 |
| Standard. | 8GB | 128GB | UFS 2.1 |
| Expanded | 8GB | 256GB | UFS 2.1 |
| Transparent Edition | 12GB | 256GB | UFS 2.1 |
How much memory is available to the user after switching on
After first turning on the new Xiaomi Mi 9 and completing the initial setup, the user is faced with real free space figures.As mentioned earlier, the claimed 128 GB or 256 GB are never fully available. At system start, the occupied volume can be from 15 to 25 GB depending on the firmware version and the applications preinstalled.
For the version with 128 GB, the user is usually available about 105-110 GB of free space. In the 256 GB version, approximately 230-235 GB remain free. RAM is also subject to system reserves: of 6 GB, about 4.5-5 GB can be physically available for applications, the rest is reserved by the system core and drivers.
Over time, the amount of free memory is reduced due to the accumulation of cache applications, system logs and user content. Android file system is prone to fragmentation, although modern UFS controllers minimize the impact of this factor on speed. Regular cleaning of temporary files helps to maintain high performance.
💡
The actual amount of available memory is always 10-15% less than claimed due to system files and differences in byte counting systems.
How to check memory Xiaomi Mi 9
To know the exact state of your smartphone's storage, you don't need to install third-party programs. There's a powerful monitoring tool built into the MIUI shell. Go to the Settings menu, then select About Phone and click on Warehouse. Here you'll see a detailed space distribution diagram.
It's going to show you how much space apps, images, videos, audio files, etc., take, and you can also use the built-in Security app that has a Cleanup section, which not only shows you the space, but also offers you to remove the garbage that you've accumulated over time.
For more advanced users, an engineering mode or use is available ADB-commands, but in most cases, the standard storage interface is enough, and if you see that the "Other" partition takes up a disproportionate amount of space, it may indicate the accumulation of messenger cache or residual files of remote programs.
- 🔍 Path to the menu: Settings → The phone. → Warehouse.
- 🧹 Cleaning Tool: Security App → Cleanup.
- 📊 Analytics: Detailed analysis of file categories in settings.
Problems of space shortage and their solution
The lack of space on the Xiaomi Mi 9 can lead to serious problems: the phone will start to work slowly, applications will fly out, and new photos will not be saved. The first step in solving this problem should be to revise multimedia files. High-resolution photos and videos quickly eat up gigabytes, so they are better transferred to a computer or to the cloud storage.
The second important aspect is the cache of social networks and instant messengers: apps like Telegram, WhatsApp and VK can take up tens of gigabytes, saving all the images and videos viewed. Each app has a cache cleaner feature in its settings, which is recommended to use regularly, and it is also worth removing unused games and heavy programs.
☑️ Checklist for vacancy of the seat
If standard methods don't work, you might want to consider resetting the device to factory settings, a radical method that will return the phone to its original state, just like after you buy it. Be sure to back up all the important data before you do, as it will be permanently deleted during the reset process.
⚠️ Warning: Don’t let the memory fill up completely. If less than 500 MB is free, Android may start to work unstable, and the process of updating apps in Google Play may be interrupted with an error.
What is a swap file and is it needed?
Use of cloud technologies and USB OTG
Since you can’t expand physical memory in the Xiaomi Mi 9, using external drives via the USB Type-C port is a great solution. USB OTG technology allows you to connect flash drives and external hard drives directly to your smartphone. This is the perfect way to quickly transfer a large amount of files or watch a movie in high quality without internal space.
Cloud services like Google Photos, Yandex.Disk or Mi Cloud allow you to automatically upload media files to the server and free up space on your device with a single click. Auto sync setting ensures that your data is not lost in the event of a phone breakdown and you can always access it from any other device.
When choosing a flash drive to connect to Xiaomi Mi 9, pay attention to read and write speed. Using cheap USB 2.0 drives can lead to long copying of files. The best choice will be modern USB 3.0/3.1 flash drives and Type-C interface.
💡
Use a file manager with support FTP/SFTP for fast wireless transfer of large files from phone to computer, so as not to occupy USB-cable-port.