How to switch memory to SD-Map in Xiaomi Redmi 9: a complete guide with nuances

Xiaomi Redmi 9 is one of the most popular budget smartphones with the ability to expand memory with a microSD card. However, just inserting a card into a slot is not enough: to really save space in internal memory, you need to configure it correctly. In this article, we will discuss all the ways to transfer data to SD-card – from basic file saving to turning it into internal storage (Adoptable Storage).

It's important to understand that not all methods are equally effective. SD-Redmi 9 card has limitations due to features MIUI We will explain in detail which data can be moved without risk and where workarounds will be required, and we will also explain how to avoid the typical mistakes, from formatting a map in an inappropriate file system to losing data when extracting it incorrectly.

If you're faced with a message that says "Not enough memory," or you just want to optimize your phone space, this guide will help you understand all the nuances. SD-maps and finish with fine-tuning system parameters.

1. Preparation SD-maps: selection and formatting

Before you set up SD-The map is like a storage, it needs to be properly prepared, and this depends on the speed and compatibility with Xiaomi Redmi 9.

Requirements for SD-map:

• 🔹 Speed class: not lower than Class 10 (optimally — UHS-I U1 or U3). Class Class Cards 4/6 They'll slow down the system.
• 🔹 Volume: 16 GB (recommended 32-128 GB for comfortable work) Cards of 2 TB or more may not be supported.
• 🔹 File system: exFAT or FAT32 (For cards up to 32GB, the phone formats it into internal memory. ext4 automatically.
• 🔹 Brand: Preferably SanDisk, Samsung EVO, Kingston – They are less forged and more stable.

Before using, be sure to format the card directly in your smartphone, even if it is new, this will remove possible errors of the file system and prepare it for work with MIUI.

1. Insert the card into the slot (in Redmi 9 it is combined - nanoSIM + microSD).
2. Go to Settings → Storage → Memory Map.
3. Click “Format” and select “Like a portable device” (if you plan to use a card for files) or “Like internal storage” (for porting applications).

⚠️ Warning: Internal memory formatting erases all data on the card and encrypts it, and then the card cannot be read on other devices without being completely reset.

2. Method 1: Use of SD-maps as portable storage

The easiest and most secure way to do this is to set up the map as an external storage for photos, videos, music and documents, which won't allow you to migrate apps, but will free up space in your internal memory through media files.

How to transfer files to SD-map:

1. Open the File Manager app.
2. Select a category (such as “Images” or “Audio”).
3. Click on the three dots in the upper right corner → “Select” → tick files.
4. Slip "Move" and point the way to SD-map, /storage/XXXX-XXXX/DCIM).

To automatically save new files to the card:

• 📷 Photo/video: Open the camera → setting (⚙️) → «Warehouse» → choose SD-map.
• 🎵 Music/Downloads: In apps (such as Mi Music or Chrome), find your download settings and point the path to the map.

This method does not require root rights and is suitable for most users, but it does not solve the problem of memory shortage if it is occupied by applications or cache.

Method 2: Adjustment SD-The card as an internal storage (Adoptable Storage)

A more radical way to do this is to SD-This allows you to transfer applications (partially) and system data to the card, but there are serious limitations to the method:

• 🔄 The card will be encrypted and linked to the phone, and once it's extracted, the data will be inaccessible.
• ⚡ The speed of the card affects the performance of the phone. Cheap cards can cause lags.
• 📱 Not all applications support the transfer to SD-map (especially system and high-demand games).

Step-by-step:

1. Put it in. SD-phone-card.
2. Go to Settings → Storage → Memory Map.
3. Click on three dots in the top right corner → “Storage settings” → “Format as internal.”
4. Confirm the action and wait until it is completed (may take 5-10 minutes).
5. After formatting, select “Move Data Now” (optional).

⚠️ Warning: If after setting up the phone starts to brake, return the card to portable storage mode. To do this, reset the phone settings to factory (Settings) → The phone. → Resetting settings).

To move applications to SD-post-setting:

1. Open Settings → Applications → Application Management.
2. Select the application → «Warehouse» → «Change» → specify SD-map.

4. Transfer of applications to SD-root-card

Even if SD-The card is configured as an internal storage, not all applications can be moved. MIUI It blocks the movement of system utilities and some games.

Methods of transferring applications:

• 📲 Through Settings: As described above, but only works for a fraction of applications (usually those that support this feature themselves).
• 🖥️ Through ADB: It allows you to forcibly transfer almost any application, but requires a connection to a PC.
• 🔧 Using third-party utilities: applications like AppMgr III or Link2SD (last-minute).

Instructions for ADB:

1. Turn on Developer Mode (7 times tap on the MIUI version in Settings → About Phone).
2. Activate "Debugging by" USB» In Settings → Additionally. → For developers.
3. Connect your phone to your PC, open the command line and type: adb shell pm set-install-location 2 This command will force the system to install new applications on the PC. SD-default-card.
4. To transfer an already installed application (for example, Facebook), use: adb shell pm move-package com.facebook.katana Replace com.facebook.katana with the desired application package (you can find it through App Inspector).

Not all applications will work correctly after the transfer, for example, widgets may disappear, and notifications may come with a delay.

💡

Before transferring applications to SD-check the card's compatibility. Some games (e.g., games, PUBG Mobile or Genshin Impact Refuse to Work with External Memory Due to Cheat Protection.

5. Mistakes and problems in working with SD-card

In the case of SD-Xiaomi Redmi 9 cards users often face typical errors. Let's analyze the most common and ways to solve them.

If the phone makes a mistake «SD-The card is damaged, try it:

1. Remove the card and insert it back.
2. Connect your phone to your PC and check the card for errors through chkdsk (in Windows: chkdsk E: /f, where E: is the drive letter).
3. If nothing helps, format the card (the data will be lost).

💡

If SD-The map has ceased to be determined after the update MIUI, Try resetting the storage settings: Settings → Annexes → Application management → Three points. → Reset the settings.

6.Alternative ways to free up memory

If the data is transferred to SD-The card has not solved the problem of memory shortage, consider additional optimization methods:

• 🧹 Cache Clearing: Go to Settings → Warehouse → Clear the cache. It can free up to a few gigabytes.
• ☁️ Cloud Storage: Move photos and videos to Google Photos or Mi Cloud (Redmi 9 has 5GB for free).
• 🗑️ Remove unnecessary files: Use the built-in “Security” app → Cleaner) for garbage retrieval.
• 🔄 Factory reset: the last resort if the phone is clogged with system debris.Be sure to back up through Settings before resetting → The phone. → Backup.

To automate memory cleaning, configure:

1. Automatically remove screenshots older than 30 days: Settings → Storage → Autoclean.
2. Cache Limitation for Individual Applications: Settings → Apps → [Select App] → Storage → Clear Cache.

If you install and remove applications frequently, turn on the option “Delete cache data when you delete the application” in Settings → Storage → More.

7. Comparison of methods: which to choose?

What is the way to transfer data to SD-So, the map is right for you, and we'll compare the pros and cons of each method:

For most owners of Xiaomi Redmi 9, the best solution is a combination of methods:

1. Use it. SD-map as a portable storage for photos and videos.
2. Move some applications through ADB (if you have experience).
3. Clean the cache regularly and delete unnecessary files.

If you need to free up your internal memory as much as possible and are ready to experiment, try the internal storage mode, but be prepared for possible brakes.

FAQ: Frequent questions about SD-Maps in Xiaomi Redmi 9