Connection SD-Xiaomi Redmi 9: from the choice of the drive to the transfer of applications

Xiaomi Redmi 9 is one of the most popular budget smartphones of 2020, which is still actively used due to balanced specs. However, 32 or 64 GB of internal memory quickly run out if you store a lot of photos, videos or install heavy games. The solution is to connect a microSD card that can expand memory to 512 GB (depending on the card model).

In this article, we'll look at the whole process from A to Z, from choosing a compatible memory card to the subtleties of configuring it as an internal or external drive. SD-Map – a function that does not work on all firmware MIUI, But it can save a lot of space, and you'll also learn why your smartphone sometimes doesn't see the map, and how to fix it without losing data.

If you’ve just bought a Redmi 9 or have been using it for a long time but have never used a microSD, this guide will help you get it right the first time, and if you’ve already had experience, you may find useful life hacks here that you didn’t know about before.

1. What? SD-Choosing a map for Xiaomi Redmi 9: technical requirements

Not every microSD is suitable for Redmi 9.The smartphone supports microSDXC cards (up to 512 GB) with exFAT file system or FAT32, but there are nuances:

• 🔹 Speed class: minimum Class 10 (UHS-I), but for recording video 4K Frequent file transfer is better to choose U3 or V30.
• 🔹 Capacity: officially supported cards up to 512 GB, but in practice with 256 GB cards+ There may be problems with older versions. MIUI.
• 🔹 Brand: Give preference to proven manufacturers – SanDisk, Samsung EVO, Cheap no-name cards are often forged to indicate inflated volume.

Redmi 9 has a hybrid slot (2) SIM + 1 microSD OR 1 SIM + 1 microSD. That means you have to donate a second memory card to use it. SIM-If you need two, you need two. SIM and SD-card at the same time – consider models with a separate slot (for example, Redmi Note 10).

⚠️ Note: If you buy a used memory card, be sure to check it for authenticity using the utility H2testw (Windows or F3 (Linux/macOS). Fake cards often have a real volume of 2–4 less than the amount claimed, which leads to data loss.

Preparation SD-Maps before connection: formatting and verification

A new memory card is not always ready to use out of the box. To avoid errors when connecting to Redmi 9, follow these steps:

1. Check the card on your PC. Connect it through the card reader and make sure the computer determines the full volume. If Windows asks you to format the card, that's okay with a new drive.
2. Format in the correct file system: 📁 For cards. ≤32GB: FAT32. 📁 For cards. >32 GB: exFAT (not) NTFS!).

Use official utilities

SD Card Formatter

SD Association

If the card has already been used on another device (camera, recorder), it should also be formatted, which will remove possible hidden files that may conflict with Android.

PC volume check|Formatting in exFAT/FAT32|Delete hidden files (if any)|Checking for errors (chkdsk)-->

⚠️ Warning: Never remove a memory card from Redmi 9 while writing files or transferring applications.This can cause file system damage and data loss.Always use Safe Retrieval in the Notification Curtain.

Redmi 9: the smartphone does not support Adoptable Storage (full unification) SD-Internal memory cards on versions MIUI This means you can't install all the apps on the map -- just a fraction of them.

3. Step-by-step instruction: how to insert SD-Map in Xiaomi Redmi 9

The process of physically connecting a memory card is simple, but requires care.

1. Turn off your smartphone. This is not necessary, but it is recommended to avoid possible failures in card recognition.
2. Find a slot for SIM/SD. At Redmi. 9 It's on the left side of the box (if you look at the screen), and you can use a needle from the kit or a clip to open the tray.
3. Set the map: 📱 If you use one SIM + SD: Put the nano-SIM in the top slot and the microSD in the bottom slot. 📱 If you only use it SD: Insert the memory card in the bottom slot, leave the upper one empty.

Make sure the card contacts look down and the bevelled angle matches the shape of the slot.

Move the tray carefully.

Turn on the phone.

If you haven’t seen a notification of a new memory card after turning on, check:

• 🔍 Is the card inserted correctly (try to re-insert and re-insert).
• 🔍 Is there any physical damage to the contacts of the card or slot.
• 🔍 Does your firmware support MIUI large-volume cards (some custom firmwares have restrictions).

4.Tune in. SD-Cards in the system: external or internal drive?

Once you connect the card, Redmi 9 will offer you the option to choose how to use it:

1. As an external drive (recommended for most users).
2. As internal memory (only for experienced users).

Let’s discuss both options in detail:

Option 1: External Storage (Portable Storage)

This regime allows:

• 📁 Store photos, videos, music and documents.
• 🔄 It is easy to retrieve the card and use it in other devices.
• 📱 Install part of the applications on SD (If the developer has authorized it).

Limitations:

• ❌ You can not transfer all applications (only those that support installation on the Internet). SD).
• ❌ Some games may not work with the card due to protection against piracy.

Option 2: Internal memory (Adoptable Storage)

In this mode, the map is formatted and encrypted, becoming part of the system.

• 📱 You can move more apps, but not all of them).
• 🔒 Data on the card is protected by encryption (as in internal memory).

Disadvantages:

• ⚠️ The card cannot be removed and used in another device without formatting.
• ⚠️ When resetting the phone to factory settings, the data on the map will be deleted.
• ⚠️ Some low class cards (Class) 4/6) They'll slow down the system.

How do you choose a regime?

1. After inserting the card, a notification will appear "New" SD-- A map. - Slap it on it.
2. Select "Configure" → "Internal memory" or "External storage".
3. If you have selected internal memory, confirm the formatting (all data will be deleted!).

💡

If you often shoot videos in full HD or 4K, Select the external drive mode and save files directly to SD-This will save space in the internal memory and speed up the recording (if the card is a class card). U3/V30).

5 How to transfer applications to SD-map

Even if you set up the card as internal memory, not all applications can be moved. Here's how it works.

1. Open Settings → Applications → Application Management.
2. Select the app you want to migrate (like Facebook or Spotify).
3. Slip on the "Storage" item.
4. If the "Change" option is active, click on it and select "SD-map".

Pay attention to the nuances:

• 🔹 Not all apps support portability. Many games, for example, PUBG Mobile or Genshin Impact will block this feature.
• 🔹 System applications (e.g. Camera or Gallery) cannot be moved.
• 🔹 After the transfer, the widgets of the application may stop working.
• 🔹 Some applications are automatically returned to internal memory after updating.

An alternative way to save space:

• 📸 In camera settings (Settings) → Camera. → Select the place of preservation "SD-map.
• 🎵 In music players (such as Mi Music), specify the path to the folder on the SD-map.

⚠️ Attention: Transfer of applications to SD-Class 10 and below cards can cause them to slow down or fly out. UHS-I U3 or A2 (application-optimized).

💡

Transfer of applications to SD-The map in Redmi 9 is selective and depends on the developer's policies. For most games and social networks, this is not the right way to use the map for media files.

6. Frequent errors and their solutions

Even with the right connection to SD-There may be problems with a map, and here are the most common ways to fix them:

If the card is unstable (for example, disappears after sleeping), try:

1. Disable Battery Optimization for File Manager (Settings) → Battery → Optimizing the battery → All applications → Files).
2. Update firmware MIUI Up to the latest version (old versions had bugs with the SD-map).
3. Check the card on another device, it may be damaged.

7. Optimization of use SD-Maps: Advice for Advanced Users

To make the most of the extra space, follow these guidelines:

• 📂 Separate files into folders: SD-map/ ├── Photo Photo/ ├── Video/ ├── Music/ ├── Documents/ └── Applications/ This will simplify search and backup.
• 🔄 Set up automatic saving: Photo/video: Camera settings → Preservation site → SD-Downloads: In the browser (Chrome, Mi Browser) specify the path to the folder on the SD.
• 📱 Use file managers with support SD: Mi File Manager (built-in). Solid Explorer or FX File Explorer (Extended Features).
• 🔒 Encrypt sensitive data. MIUI you can encrypt folders SD-map through settings → Confidentiality → Encrypted folders.

For users who often work with large files (e.g. video) 4K), usefully:

• 🎥 Use the cards V60/V90 video-recording.
• 📊 Regularly check the free space with applications like DiskUsage.
• ☁️ Automatically backup important files to the cloud (Google Drive, Mi Cloud).

💡

If you frequently switch between devices (such as a smartphone and tablet), format SD-You can use the card in exFAT and use it as a portable drive, and it's a universal format that's supported by Android, Windows, macOS, and even some TVs.

8. Alternatives SD-The map: When it's not enough

Even if SD-256GB card you are short of space, consider these options:

• ☁️ Cloud storage: Google Photos (unlimited storage of compressed photos / videos). Mi Cloud (5 GB free, integrated with the Internet) MIUI). Yandex Disk or Mail.ru Cloud (10-100 GB free).
• 🖥️ Network storage (NAS). If you have a router at home USB-port, connect an external hard drive to it and configure access over the local network.
• 📱 OTG-Drives, plug-in flash drives. USB-C Micro-USB (required) OTG-Adapter. Supports volumes up to 2 TB.
• 🔄 Regular cleaning: Settings → Memory. → Cleaning or Settings → Annexes → Clear the cache

For users who store a lot of media, the best solution is a combination of SD-map + For example, clouds:

• 📸 Photos: automatically uploaded to Google Photos in original quality (paid) or compressed (free).
• 🎵 Music: stored on SD-map, but duplicated in Yandex Music or Spotify.
• 📄 Documents: synced via Google Drive or Dropbox.

⚠️ Note: If you use cloud services for backup, make sure you have Wi-Fi-only Download feature enabled (Settings) → SIM-maps and mobile networks → Transfer of data → Traffic limit; otherwise, automatic downloads could eat up the entire mobile Internet.

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