Where does memory disappear on Xiaomi Redmi 5: 7 hidden reasons and ways to return gigabytes

You’ve noticed that your Xiaomi Redmi 5 suddenly loses space even though you’ve barely installed anything? 16 or 32 GB of storage claimed by the manufacturer is melting in front of your eyes, and the system persistently reports a lack of space. This problem is familiar to most owners of budget Xiaomi smartphones, especially on older models like Redmi 5 with limited internal memory.

It’s not just about your photos or apps. MIUI It actively reserves memory for system needs, and some processes work in the background, stealthily "eating" precious megabytes. In this article, we will analyze the unique features of Redmi 5, which cause memory to disappear faster than on other smartphones - from hidden logs. MIUI You will learn how to find and delete unnecessary files, optimize the system and even return part of the “stolen” memory without root rights.

Systemic “reserves» MIUI: Why 16GB turns into 10GB

The first and most obvious reason is the markup of memory under the MIUI. Even on a clean smartphone without installed apps, the system takes from 4 to 6 GB only for its own files:

• 📁 Section /system (near 2–3 GB) – it stores system applications, libraries and the Android kernel.
• 📄 Section /vendor (before 1 GB) – drivers and proprietary components for Redmi iron 5 (Snapdragon processor 450, camera modules, etc.).
• 🔄 Reserve space (up to 500 MB) — MIUI Leaves it “in reserve” for updates and temporary files.

In practice, this means that 16 GB in the Redmi version 5 2/16 GB is available to the user ~10–11 GB. And when you consider that MIUI creates duplicates of some files for quick access (for example, thumbnails of photos in the gallery), the free space melts even faster.

Another nuance is the file system. F2FS, It's optimized for flash memory, but it has a peculiarity: when you write small files (like an application cache), it takes up more space than the real data size.

⚠️ Note: Do not confuse this with fragmentation in the traditional sense (as in the case of the sect). HDD). On smartphones with eMMC memory, defragmentation is not only useless, but also reduces the life of the drive.

2.Cache and App Garbage: How Facebook and MIUI Launcher steals gigabytes

The most obvious memory eater is the app cache, but on Redmi 5, it's particularly aggressive because of two factors:

1. CPU architecture: Snapdragon 450 has a weak cache L2 (512 KB, so the system compensates for this by using the disk cache.
2. MIUI Optimizations: Xiaomi’s proprietary shell caches even data that isn’t used (e.g. thumbnails of video in a gallery or web page previews in a browser).

Let's look at the top.-5 The apps that most often clog up memory on Redmi 5:

How do you clean the cache correctly? It's not enough to just click "Clear cache" in the app settings.

Delete application data in Settings → Annexes → Application management → Warehouse

Clear the file. /storage/emulated/0/Android/data File Manager (requires rights)

Disable Auto-Update Apps in Google Play → Settings → Auto-update

Restart the phone after cleaning (MIUI count out)-->

Pay special attention to the folder /storage/emulated/0/MIUI/ — here MIUI It stores temporary files for themes, wallpapers and animations, and can be safely cleaned manually (except for theme folder if you use custom themes).

3. Hidden Logs and Dumps: Why MIUI record

Redmi 5 on the MIUI It has a nasty feature, which is over-logging, and it creates debugging files (logs) even in normal operation, not just when they crash, and these files are stored in hidden folders and can take up to 2-3 GB.

Where to look:

• 📜 /data/log/ — Basic system logs (access only with root).
• 📜 /storage/emulated/0/MIUI/debug_log/ — logic MIUI (remove without root).
• 📜 /data/tombstones/ — Memory dumps when applications are colored (requires root to clean up).
• 📜 /cache/ — Temporary update and recovery files (cleaned through recovery-mode).

How to reduce the volume of logs:

1. Turn off the debugging. USB In Settings → The phone. → Version. MIUI (7 times tap, then in Additional settings → For developers).
2. In the same developer menu, turn off Logistics HCI and Bluetooth journaling.
3. Install the Logcat Reader app (from F-Droid) and manually clear logs through it.

⚠️ Note: If you notice that the folder /data/log/ grow faster 100 MB per day is a sign of a system failure, so maybe it's time to reset your phone to factory settings or reflash it through Fastboot.

4. eMMC errors: why memory "evaporates" on its own

Xiaomi Redmi 5 is equipped with internal memory type eMMC 5.1 (manufacturers — Samsung, Hynix or Micron).

1. Cell degradation: Over time, the eMMC loses capacity due to wear and tear (especially if the phone often overheats or discharges to zero).
2. Controller errors: Cheap chips may not display free space incorrectly due to failures in the partition table (FTL — Flash Translation Layer).

How to check the health of eMMC:

• 📊 Install. AIDA64 And check the Warehouse section. → If the good blocks are less than 95%, the memory is degraded.
• 🔧 Use the eMMC Check Tool (requires root) to scan for broken sectors.
• 📉 Watch the recording speed: if it falls below 10MB/s, it’s a sign of wear and tear.

If the problem is in the controller, only replacing the chip (cost - from 1500 rubles.).

Complete reset via Fastboot (Fastboot erase userdata command)

Format memory in TWRP Recovery (Select Format Data) → Yes)

Warm up the phone with a hairdryer (60)°C) - sometimes helps with soldering contacts errors-->

Redmi 5 often has a bug where the system shows 0 MB freely, although the files take only a few gigabytes. FUSE (Filesystem in Userspace – Component MIUI, It's a partition mounting system, and it's a reboot or a reset.

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If the memory still “disappears” after reset, the problem is almost certainly the hardware wear of the eMMC. In this case, only replacing the chip or buying a new phone will help.

5. MIUI-Chips that steal memory: themes, cloud and duplicates

MIUI It's known for its "chips," many of which work in the background and quietly take up space:

1.Themes and wallpaper

Each established topic from MIUI Themes weighs from 50 before 200 MB, even if you're not using it. /data/system/theme/ It doesn't automatically remove it:

1. Go to Settings → Themes.
2. Press three points. → My subjects. → remove unnecessary.
3. Clear the folder. /storage/emulated/0/MIUI/theme/ manually.

2. MIUI Cloud (Xiaomi Cloud)

Even if you don’t use the cloud, MIUI synchronize:

• 📸 Photo miniatures (folder) /MIUI/CloudPhoto/thumb/).
• 📄 Notes and notes from the Notebook.
• 🔕 Call data and SMS (if synchronization is enabled).

Turn off sync in Settings → Xiaomi account → Mi Cloud and clean the folder /MIUI/Cloud/.

3. Duplicate media files

MIUI Automatically creates copies:

• 📷 Photo from Google Photos in a folder DCIM/.thumbnails.
• 🎵 Album covers in /AlbumArt (can weigh up 300 MB).
• 📥 Downloaded files from messengers in Download and Android/data.

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To find duplicates, use the Files by Google app (the Cleanup tab» → «Duplicate files. It is free and does not require rooting.

6.Viruses and malware: how ad bots clog memory

Redmi 5 on the MIUI It's vulnerable to adware viruses that masquerade as system processes and download ads in the background:

• 📥 Upload banners and videos to the folder /Android/data/com.android.chrome/ (Even if you don’t use Chrome).
• 📦 Install APK-file /download/ or /Android/obb/.
• 📊 Create activity logs in /data/data/ (You can only see root).

Signs of infection:

• Memory is reduced by 100-300 MB per day for no apparent reason.
• B Settings → Battery appears unknown processes (com.android.system or update.service).
• Advertisements appear in notifications or on top of other apps.

How to treat:

1. Install Malwarebytes or Dr.Web Light and scan the system.
2. Check the list of installed applications in Settings → Apps for suspicious ones (such as System Update if you haven’t updated your phone).
3. Clear the folders: /storage/emulated/0/Download/ /storage/emulated/0/Android/obb/

⚠️ Warning: Some viruses block access to Settings or Google Play. If this happens, download your phone to Safe Mode (press the power button). → long tap on "Switch off» → «Reboot in Safe Mode and remove malware from there.

7 How to Free Memory on Redmi 5 Without Losing Data

If you don’t want to drop your phone before the factory settings, use these methods (from the safest to the radical):

1. Transfer of applications to SD-map

MIUI It allows you to transfer only a part of the applications, but even this will free up 1-2 GB:

1. Put it in. SD-card (preferably class 10 or UHS-I).
2. Go to Settings → Applications → Application Management.
3. Select the application → Warehouse → Change. → SD-map.

Limitations: System applications and games (e.g, PUBG Call of Duty cannot be moved.

2. Clean through ADB

If the phone doesn’t see space, even though the files take up little space, do:

adb shell pm trim-caches 256m

This command compulsorily clears the cache of all applications, including system ones.

3. Use Link2SD (requires root)

Annex Link2SD permitting:

• 🔗 Transfer cache and application data to SD-map.
• 🗑 Remove system applications (e.g. Mi Video or Mi Music).
• 📦 Convert user applications to system (saves space).

4.Dumping through TWRP

If the memory is “hung” by 0 MB:

1. Install. TWRP Recovery for Redmi 5 (version 3.2.3 or later).
2. Load into recovery (Nutrition + Volume Up).
3. Choose Wipe. → Advanced Wipe → mark Dalvik / ART Cache and Cache.
4. Reboot. The system will count the vacant space.

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On Redmi 5 with 16 GB of memory, it is optimal to leave at least 1.5-2 GB free. Otherwise, the system will start to slow down due to lack of space for temporary files.

FAQ: Frequent questions about memory on Xiaomi Redmi 5