Combining a memory card with internal storage on Xiaomi Redmi Note 7: detailed instructions with nuances

Owners of Xiaomi Redmi Note 7 often face a shortage of internal memory, especially if the model with 32 or 64 GB. The solution is to combine the microSD card with internal storage through the Adoptable Storage function (in Android) or the expansion of memory (in MIUI). But there are pitfalls here: not all cards are supported, the process is irreversible without reset, and once combined, the card cannot be removed without data loss.

This article provides a step-by-step guide to MIUI 10/11/12, a comparison of FAT32/exFAT/NTFS formats, and answers to key questions: what happens to data after the combination, how to get it back, and why the system might refuse to format a card. If you want to use microSD as a full-fledged memory extension for applications, not just for photos and music, read on.

⚠️ Important: Memory integration is a risk operation. If you interrupt the formatting process or use an incompatible card, data can be lost and your phone can freeze.Be sure to back up important files to your PC or cloud before you start.

1. Which memory cards are suitable for combining with Redmi Note 7

Not every microSD is compatible with memory expansion. Xiaomi Redmi Note 7 supports cards up to 256 GB, but there are additional requirements to combine with internal memory:

• 🔹 Speed class: not lower UHS-I (Class 10) or A1/A2. Class cards 4 or 6 Not suitable – the system will refuse to format.
• 🔹 File system format: before combining, the card will be formatted into ext4 or f2fs (depending on the version MIUI). Reference format (FAT32/exFAT) irrelevant.
• 🔹 Manufacturer: SanDisk Ultra, Samsung cards are recommended EVO, Kingston Canvas – Cheap no-name cards can be unstable.
• 🔹 Status: The card should be new or with minimal wear and tear. If it has been used in other devices before, complete the full formatting on your PC.

💡 How to check card speed? Install the application A1 SD Bench from Google Play. If the write speed is below 10 MB/s, the card is not suitable for combining.

⚠️ Warning: Once combined, the card becomes an integral part of the system, it cannot be removed without resetting the phone to factory settings, and some applications (such as WhatsApp or Telegram) may refuse to work with extended memory.

2. Preparation of the phone before memory combination

Before starting the procedure, follow the mandatory steps:

1. Back up all your phone data (photos, contacts, messages) through Settings → About Phone → Backup or using Mi Cloud.
2. Charge the phone at least 50%. If the battery runs out during formatting, the card may fail.
3. Remove unnecessary files from internal memory to make room for service data (MIUI requires at least 1-2 GB of free space for operation).
4. Remove the card (if it is already inserted) and check it on your PC using H2testw for broken sectors.

🔧 How to check the card for errors?

1. Insert the card into the card reader and connect to the PC.


2. Launch the command line on behalf of the administrator.




3. Enter: chkdsk X: /f (where X is the letter of the card disk).




4. Wait for the inspection to be completed.

If the utility finds errors, the card is better not to use for association.

3. Step-by-step instruction: how to combine a card with memory

The process varies depending on the version of MIUI. Below is the universal instruction for the Redmi Note 7 on MIUI 10–14 (Android 9–12).

1. Put the memory card in the phone slot. Wait for identification (the notification will appear "New" SD-map").
2. Open the Settings and go to Memory → Memory Map.
3. Click on “Format as internal” (or “Expand Memory” in newer versions of MIUI).
4. Confirm the action and wait for the formatting to be completed (may take 5-15 minutes).
5. Select "Move Data" if the system suggests moving applications and media to the map.
6. Reboot your phone after the process is complete.

⚠️ Note: If after formatting the phone hangs on the logo MI, Execute a hard reset (clutch the power supply). + Volume up 10 seconds. This can happen because of a map that is incompatible.

📌 What happens to the card after the merger?

• 🔐 It's encrypted and it's tied to the phone.
• 📱 Becomes part of the section /data, wherein applications are installed.
• 🚫 You can't get it out without factory reset.
• ⚡ The speed of operation depends on the class of the card (A1/A2 faster).

4. How to transfer applications to a joint map

After the memory is merged, not all applications will automatically move to the map, to free up the internal memory.

1. Open Settings → Applications → Application Management.
2. Select an app (such as Facebook or Google Maps).
3. Press "Storage" → "Change".
4. Choose. SD-Card (if the option is active).
5. Confirm the transfer and wait until it is completed.

⚠️ Limitations:

• 🚫 System applications (Mi Store, Camera) cannot be transferred.
• 🎮 Cache games >1GB can slow down if the card is slow.
• 🔒 Some apps (such as Netflix) block work from external memory due to security policies.

Critical information: After transferring an application to a map, its performance can drop by 10-30% (depending on the card class). Tests on the Redmi Note 7 showed that games like PUBG Mobile or Genshin Impact are better left in internal memory.

💡

Before you transfer the app, check its size in Settings → Memory. If it weighs <100 MB, there is no point in carrying it - space savings will be minimal.

5 How to unplug the map and get it back

If you decide to give up the combined memory, there are two ways:

Method 1: Through settings (without resetting)

1. Go to Settings → Memory → Memory Map.
2. Click "Perpassible" (or "Portable").
3. Confirm the formatting. All data from the map will be deleted!

Method 2: Reset your phone (if the first method doesn’t work)

1. Make a backup copy of the data.
2. Go to Settings → About the phone → Reset settings.
3. Select "Reset all settings."
4. After the reboot, remove the map and format it on the PC.

⚠️ Note: If the card has been encrypted MIUI, It can not be formatted on a PC – you will need a special utility like DiskPart:

diskpart


list disk




select disk X (where X is the card number)




clean




create partition primary




format fs=fat32 quick

6. Frequent errors and their solutions

When combining memory, Redmi Note 7 users face typical problems:

🔧 If the card is not determined:

1. Try to insert it into another slot (if any).
2. Clear the card contacts with alcohol.
3. Update MIUI to the latest version.

💡

If the phone slows down after the combination, the likely cause is a slow memory card, return the settings to the original settings and use the card only for media files.

7. Alternatives to association: other ways to save memory

If the risks of joining together are scary, consider alternatives:

• 📁 Transfer media files: In camera settings (Camera settings) → Storage) select saving photo/video on SD-map.
• ☁️ Cloud Storage: Automatic Photo Upload to Google Photos or Mi Cloud (up to 5GB free).
• 🗑️ Cache Clearing: Regularly delete the app cache through Settings → Memory. → Clean up.
• 🔄 Lite versions of apps: Install Facebook Lite, Messenger Lite – they take up 2-3 times less space.

📊 Comparison of memory saving methods:

8. FAQ: Answers to popular questions