How to combine internal and external memory Xiaomi Redmi 9A: guide

Owners of Xiaomi Redmi 9A Often, they face a shortage of internal memory, especially if the device is used to store photos, videos or heavy applications, and one effective solution to this problem is to combine internal and external memory into a single storage. This approach allows you to expand the available space without the need to constantly transfer files manually or delete important data.

However, the process of combining has its nuances: not every microSD card is suitable for this purpose, and the wrong actions can lead to data loss or malfunctions in the smartphone. In this article, we will discuss in detail all the official and alternative ways of combining memory on Redmi. 9A, This includes drive requirements, step-by-step instructions, and problem-solving, and highlights the differences between Adoptable Storage and Portable Storage, and why some methods may not work on your device.

Before you start combining, it is important to understand that this process irreversibly formats the memory card, so all data from it will be deleted, and it is worth considering that once combined, the card will not be removed without first “disconnecting” the memory – otherwise the smartphone may not work correctly or at all.

1. Memory card requirements for Redmi combination 9A

Not every microSD card is suitable for combining with internal memory. - Xiaomi Redmi 9A This function is only supported by a few key conditions:

✅ The card must have a speed class. UHS-I (U1 or U3) Lower speed cards (such as Class 4 or 6) can run unstablely, causing delays in writing files or even system errors. A1 or A2 (application-optimized).

✅ Memory capacity: The minimum recommended volume is 16 GB, but for comfortable work it is better to use cards from 32 GB. 9A — 512GB, however cards over 256GB may not be recognized due to firmware limitations.

✅ File system. To merge, the card will be automatically formatted into ext4 or f2fs (This means that once combined, it will not be read on a PC without special software.

❌ That's not right:

• 🔴 Maps with physical damage or bad-blocks (check sdcard test utility in the engineering menu).
• 🔴 Fake cards (a common problem on AliExpress). H2testw or FakeFlashTest.
• 🔴 Maps previously used in other devices with Adoptable Storage (may contain residual partitions).

💡 Tip: Before buying a card, check it for authenticity using a serial number on the manufacturer's website (such as SanDisk or Samsung).Fake cards often have an underrated speed and can fail when used intensively.

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If you plan to use the card to install applications, choose models labeled A2 — They are optimized for randomly writing small files, which speeds up the operation of programs.

2.The official method: Adoptable Storage in MIUI

Xiaomi Redmi 9A base-work MIUI, Adoptable Storage – the official memory pooling method introduced in Android 6.0+. This method is the safest, but has limitations: for example, the card can not be removed without first unmounting".

🔧 Step-by-step instruction:

1. Insert a memory card in the Redmi slot 9A (Only slot 2 is supported if two are used. SIM-map).
2. Go to Settings. → Memory.
3. Tap on the name of your card (for example, "SD-map: 32 GB").
4. In the upper right corner, press three dots (⋮) and select Storage Settings.
5. Choose the internal memory (internal storage).
6. Confirm the map formatting (all data will be deleted!).
7. Wait for the process to be completed (it can take 5-15 minutes depending on the size of the card).
8. After restarting the device, the memory will be combined.

⚠️ Warning: Once combined, the card becomes part of the system, and its extraction without first "disconnecting" can cause failures:

1. Go to Settings. → Memory.
2. Select a map and tap Data Transfer and Formatting.
3. Select Portable Storage (Portable Storage)
4. Wait for the data transfer to be completed and retrieve the map.

3. Alternative methods of memory consolidation

If the official method doesn’t work for some reason (e.g., the option Internal Memory is inactive), alternative methods may be used, which require more knowledge and may involve risks to the system, but sometimes are the only solution.

🛠️ Method 1: Through ADB (power-user)

This is the case with Android Debug Bridge (ADB) — Android debugging tool that allows you to manually assign the card to internal storage status, even if you're not using it. MIUI blocks this option.

📌 Instructions:

1. Activate Developer Mode: Go to Settings → About Phone and tap the MIUI version 7 times.
2. Return to Settings → Additional → For developers and enable USB debugging.
3. Connect your phone to your PC, install Xiaomi drivers, and download ADB Tools.
4. Open the command prompt in the ADB folder and type: adb shell sm list-disks Remember the disk ID (e.g., disk:179.64).
5. Enter the command to format the card as internal storage: sm partition disk:179,64 private (replace 179.64 with your ID).
6. Reset the device.

⚠️ Attention: Misuse of the right ADB If you are not sure about your actions, it is better to consult the official method or specialist.

🛠️ Method 2: Applications for memory consolidation

There are several apps on Google Play that promise to merge memory without manual intervention (e.g. Merge Memory or Merge Memory). SD Maid, but most of them:

• 🔴 Require root rights (which deprives the guarantee on Redmi) 9A).
• 🔴 May contain malicious code (especially little-known applications).
• 🔴 Often, simply transfer files to the card without combining memory at the system level.

💡 Recommendation: If you still want to try such an application, pre-create a data backup and check the reviews of other Redmi users. 9A analogous MIUI.

4. How to transfer applications to combined memory

After successful memory integration, the next task is to transfer applications to an external drive to free up internal storage. MIUI This process has its own characteristics.

📲 Method 1: Through application settings

1. Go to Settings → Applications → Application Management.
2. Select the app you want (such as WhatsApp or Facebook).
3. Slip the Warehouse.
4. If the option is available, select Change and specify the memory card.

⚠️ Note: Not all applications support portability. (Google Play Services, MIUI Launcher and some games (e.g, PUBG Mobile may not have this option.

📲 Method 2: Through ADB (forced transfer)

If there is no port option in the settings, you can try forcibly moving the application using the ADB:

adb shell pm set-install-location 2

This command sets the memory card as the preferred installation location for new applications. To return the default settings, type:

adb shell pm set-install-location 0

📊 Application compatibility table with portability:

Possible problems and solutions

When combining memory on Redmi 9A Users often encounter common errors. Let's look at the most common ones and how to fix them.

🔧 Problem 1: The option “Inner memory” is inactive

Reasons:

• 🔹 Memory card is not supported (too slow or damaged).
• 🔹 There are two devices in the device. SIM-cards, and the microSD slot is occupied by the second SIM.
• 🔹 Version. MIUI Is outdated or modified (castom firmware).

Decision:

1. Check the card on another device or via PC.
2. Take out the second. SIM-map and reboot the phone.
3. Update MIUI to the latest stable version in Settings → System Update.

🔧 Problem 2: After the merger, the phone began to slow down

Reasons:

• 🔹 The memory card has a low write/read speed (e.g. Class 4).
• 🔹 Heavy applications (games, video editors) are transferred to the map).
• 🔹 The file system of the card is damaged.

Decision:

1. Replace the card with a model marked A1/A2 or U3.
2. Move back to internal memory resource-intensive applications.
3. Perform card check through Settings → Memory. → Verification.

🔧 Problem 3: Phone can't see card after merger

Reasons:

• 🔹 The map was removed without prior "disconnection".
• 🔹 There was a failure during the formatting.
• 🔹 MicroSD slot contacts oxidized or damaged.

Decision:

1. Connect the phone to your PC and check if the card is detected in Device Manager.
2. If the card is not recognized, try formatting it through a PC in the FAT32 (utility SD Formatter).
3. Clean the slot contacts with alcohol and restart the device.

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If the phone starts to overheat or discharge quickly after the memory is combined, the memory card is likely not able to cope with the load.

6 How to get it all back: Memory Disconnection

If you decide to give up the combined memory (for example, to remove the card or replace it), you need to properly "disconnect" the storage. Failure to comply with this rule can lead to data loss or disruptions in the work of Redmi. 9A.

🔄 Step-by-step instruction:

1. Go to Settings. → Memory.
2. Select your memory card (it will be marked as "Internal").
3. Tap on three points (⋮) in the upper right corner and select Data Transfer and Formatting.
4. Select Portable Storage (Portable Storage)
5. Confirm the data transfer. The system will copy files from the card to internal memory (if there is enough space).
6. Once the process is complete, the card can be safely removed.

⚠️ If there are important files on the map, and there is not enough space in the internal memory to transfer them, connect the phone to the PC and manually copy the data to the computer before disconnecting.

💡 What to do if the option "Data port" is not available?

In some versions MIUI This item can be hidden:

1. Connect your phone to your PC and copy all the data from the card to your computer.
2. B Settings → Select the card and click Format as portable (all data will be deleted!).
3. After formatting, transfer the files back to the map.

7. Optimization of work with combined memory

To ensure that the combined memory is stable and does not slow down the system, follow these recommendations:

⚡ Optimization Tips:

• 🔋 Don't keep it on a memory card: 📁 System applications and their data. 🎮 Hard games (especially with the 3D-graphic). 📹 Video in resolution 4K (Better to store in the cloud or on PC).
• 🔄 Clean the cache regularly: Use the built-in Cleanup utility in MIUI (Settings → Memory. → Clean it. Set it for deep cleaning. SD Maid (requires root for full functionality).
• 🛡️ Protect data: Enable card encryption in Settings → Lockdown and protection → Encryption: Back up important files in Google Drive or Mi Cloud.

📊 Memory card speed test:

To make sure your card is coping with the load, conduct a speed test using the app. A1 SD Bench:

• 🟢 Normal indicators for A1/A2 maps: Reading: > 80 MB/s. Recording: > 20 MB/s (for A1) or > 40 MB/s (for A2). Random recording (4K QD32): > 1500 IOPS (for A2).
• 🔴 Signs of a "brake" card: Record speed < 10 MB/s Delays when opening applications from the card. Error messages when writing files.

If your card is performing poorly, consider replacing it with a faster model (e.g. Samsung). EVO Plus or SanDisk Extreme).

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To speed up the work of applications from the memory card, turn off animation in MIUI: Go to Settings. → Special facilities → Remove animations. It'll reduce the load on the system when you read data.

FAQ: Frequent questions about memory pooling on Redmi 9A