How to combine and expand memory Xiaomi: the complete guide

Xiaomi and its sub-brands Redmi and POCO are known for their excellent price-performance ratio, but the lack of free space is often a real problem for users. When the phone starts warning of storage overflows or apps crash due to a lack of RAM, the question arises about how to combine memory on Xiaomi for more stable operation. Modern versions of the MIUI shell and the new HyperOS offer built-in software solutions to redistribute device resources without having to climb into complex settings through the computer.

There are two main approaches to this: expanding RAM (RAM) with built-in storage and optimizing physical space for files. While the first one works at the core level and requires CPU support, the second one is available to all Android smartphone owners. It's important to understand that combining memory is not just cleaning up the cache, but changing the logic of how the system works with data. In this article, we will discuss all the available methods, from standard functions to advanced methods through ADB.

Before you take action, you need to make sure your data is saved. Any manipulation of system partitions or deep cleaning can lead to the accidental removal of important information. Xiaomi provides powerful tools for managing resources, but using them requires care. Let's look at what technologies are available in your device and how to properly activate them.

Memory Extension Memory Extension Technology

Starting with certain versions of MIUI 12.5 Enhanced Edition and MIUI 13, Memory Extension has been introduced in smartphones, which allows the system to use part of the embedded flash memory (ROM) as virtual RAM (RAM), which helps keep more applications open in the background and prevents them from being uploaded from memory, which is especially true for models with 4 or 6 GB of RAM. However, it is worthwhile to understand that the speed of virtual memory is lower than physical, so you should not expect miracles in heavy games.

Activation of this feature occurs through the standard settings menu, but the option may be hidden or absent from older device models. If your smartphone supports this technology, you can choose the amount of space allocated: usually available to add from 2 to 4 GB, and on flagships up to 7 GB. Once you turn on the device, you will need to reboot so that the system can redistribute address space.

To activate the function, perform the following actions:

• 📱 Open the Settings menu and go to About Phone section.
• 🚀 Find the line indicating the amount of RAM and click on it several times until the inscription about the activation of the developer mode appears (if not enabled).
• ⚙️ Return to the main settings menu, select Additional → Expansion of memory.
• ✅ Move the slider to the active position and select the desired amount of memory added.

⚠️ Attention: Using the memory extension function increases the wear of the built-in drive. Constantly writing and overwriting data in virtual RAM mode reduces the life of flash memory, which in the long run (via the use of virtual RAM) 3-4 year) may result in a decrease in the recording speed.

If you don’t find Memory Extension in the settings, it means that the manufacturer has not certified this model to work with this feature, or it is software blocked in your firmware version, in which case activation is possible only through root rights and editing system files, which we will discuss in a separate section.

Cleaning and optimizing built-in storage

When it comes to combining free space, users often mean freeing up space for new files. Xiaomi’s built-in memory is quickly filled with system debris, duplicate photos and instant messenger cache. The regular Security app has a powerful Cleanup module that can find unnecessary files deeper than a standard Android Explorer.

The storage system analyzer allows you to visualize which folders occupy the most space. Often, it turns out that the lion’s share of gigabytes is occupied by the TikTok, Telegram or Instagram cache. Regularly cleaning these sections allows you to “combine” disparate free megabytes into a single usable space necessary to install updates or new games.

It is recommended to follow the following algorithm of actions for maximum efficiency:

• 🗑️ Launch the Security app and select the Cleanup tool.
• 📂 Go to Storage Management for large file analysis.
• 📸 Check the folder. DCIM Trash in the Gallery, as deleted photos are often stored there for 30 days.

The file deserves special attention. Android/data, In newer versions of Android, access to it is limited, but through the Mi file manager or third-party explorers (for example, Material Files), you can safely delete the cache of games without losing progress if it is stored in the cloud. 10-15 GB space.

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Use the Deep Clean feature in the Security app once a week. It finds installations. APK-files left over from app updates that often weigh hundreds of megabytes.

Using a microSD memory card as part of a system

Many low-end and mid-range Xiaomi and Redmi models have retained the microSD card slot. This is a great way to physically increase storage. However, standard installation of the card suggests using it only as Portable Storage for photos and music. To truly combine memory and install applications on the card, you need to format it as "Internal Storage".

The formatting process erases all the data on the card, so make sure you back up. Once you put the card into internal storage mode, the system encrypts it and binds it to a particular device. It's impossible to read the data from that card on another phone or computer without resetting, and it creates a single logical space where the system decides where to write the data.

To set up, follow the following steps:

• 💾 Insert the microSD card into a phone switched off or via a hot replacement.
• 🔔 In the new card notification, select “Settings” or go to Settings. → The phone. → Memory.
• 🔄 Select the option “Use as internal storage” (Internal Storage).
• ⏳ Wait for the data formatting and migration process to end.

Note that the speed of applications from the memory card depends on the class of the card itself. For comfortable work, it is recommended to use cards of the UHS-I Class 10 or higher, marked A1 or A2, which are optimized to run applications. Cheap cards can become a bottleneck, causing interface lags.

⚠️ Warning: Do not remove a memory card formatted as internal storage without first unmounting in the settings.This can damage the application database and malfunction the system.

Comparison of methods of memory expansion

The choice of how to combine or expand memory depends on your goals and the model of the smartphone. There is no one-size-fits-all solution that works equally well. Below is a table that helps you determine the optimal strategy for your case.

As you can see from the table, regular methods are safer but provide less control. Using a memory card is a great option for multimedia, but not always ideal for heavy gaming. Software extension of RAM is a compromise solution for multitasking.

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For games, physical RAM is more important, and for storing photos and documents, the amount of built-in storage or storage is more important. SD-Don't confuse those concepts with upgrades.

Advanced methods: Swap file and Root rights

For power users who are not happy with the limitations of the standard Memory Extension feature, there is a method of creating a swap partition manually. SD-The card will be a full-fledged paging file that the system will use more aggressively than the standard extension, but it will require root rights and an unlocked bootloader.

The method is to create a special file or partition that the Linux kernel (which runs Android) will perceive as additional RAM. Unlike the standard method, you can fine-tune priorities and size here, which can give performance gains on older devices with low RAM, but requires caution.

The procedure for advanced users:

• 🔓 Get Super User Rights (Root) through Magisk.
• 📲 Install a swap management app, for example, SWAP - No Root (works with root) or KSWAPD.
• ⚙️ Create a swap file that is multiples of the power of two (e.g., 1024 MB or 2048 MB).
• 🔄 Activate swap and set up automatic start when your phone is turned on.

Using this method on modern devices with fast memory UFS 3.1 may not have a noticeable effect, since the system itself effectively manages the memory. Moreover, aggressive use of swap on fast flash memory can lead to its rapid failure due to exhaustion of the overwriting cycle.

Frequent problems and their solution

When combining or expanding memory, users may encounter a number of common errors: the system may not see the memory card, the RAM expansion function may be inactive, or the phone may start to work slower, and understanding the causes of these problems will help avoid unnecessary panic and data loss.

One of the common problems is that the memory card is incompatible, so if you format the card as an internal storage device and your phone suddenly stops seeing it, it may be that the card is out of order or has a slow write rate, in which case the system can force the data back to the internal drive if there is space, or require formatting.

There is also a situation when, after the expansion of memory, the phone begins to “brake”, which indicates that the physical read speed of the built-in drive is not high enough to work in RAM mode. In this case, it is better to turn off the function. For models with 8 GB of physical RAM and more, the extension is often not required at all, since the HyperOS system is excellent at doing background tasks on its own.

⚠️ Note: If after manipulating the memory, the phone got into a reboot cycle (bootloop), try to go to Recovery mode (clamping the volume button up and on) and reset to factory settings (Wipe Data).

Questions and Answers (FAQ)