Installation of memory card in Xiaomi Redmi 9: full instructions with nuances

Xiaomi Redmi 9 is one of the most popular budget smartphones with support for memory expansion via microSD cards. How to insert the card correctly so as not to damage the slot, how to configure it as internal memory, and why the smartphone sometimes “does not see” a new drive. In this article, we will analyze all the steps - from choosing a card to solving typical errors, taking into account the features of the hybrid slot in Redmi 9, where the microSD shares the space with the second one. SIM-card.

It is important to understand that the procedure for installing a memory card in Redmi 9 is different from models with a dedicated slot (for example, Redmi Note 10). SIM-card SIM + We will take a detailed look at how to avoid configuration errors, which cards are compatible with the device, and how to format them correctly for maximum performance.

This article will be useful for both beginners and advanced users who want to optimize the smartphone, for example, you will learn why you should not use memory cards below the A1 class to install applications, and how to transfer data to microSD without losing speed.

1. Which memory card to choose for Xiaomi Redmi 9

Not all microSD cards work equally well with Redmi 9. The manufacturer officially supports cards up to 512 GB, but there are nuances with speed classes and formats.

• 📌 Volume: 16GB to 512GB (64-256GB is recommended for price/capacity balance) Cards less than 16GB may not be recognized.
• ⚡ Speed class: minimum Class 10 (UHS-I), But you need to install applications A1 or A2 (Optimized for random I/O operations).
• 🔄 Format: only FAT32 (up to 32GB) or exFAT (64GB).Redmi 9 doesn't support NTFS.
• 🛡️ Brand: Preferably SanDisk, Samsung EVO, Kingston – They are being tested for compatibility with Xiaomi devices.

Note that if you plan to use the card as internal memory (for installing applications), its speed directly affects the performance of the smartphone. A1/A2 cards have built-in cache and are optimized for Android, while the usual Class 10 can cause lags when you start programs.

Is it worth overpaying for UHS-II or UHS-III cards? For the Redmi 9, it's overkill - its slot only supports UHS-I, so faster cards won't give you performance gains, but will cost more.

2. Preparation of the smartphone before installing the card

Before you insert a microSD into Redmi 9, follow a few steps to avoid problems:

1. Turn off your smartphone. Hot card replacement (without turning off) can damage the file system or slot.
2. Check the current configuration of the slot. If you have two installed SIM-One of the cards you need to retrieve is the Redmi 9 doesn’t support two simultaneous cards. SIM microSD.
3. Clean the slot from dust. Use a dry brush or compressed air balloon to remove particles that may interfere with contacts.

The Redmi 9 uses a hybrid slot (SIM 2 + microSD) so:

• 📱 If you use two of them SIM-You will have to choose which card to leave (usually the main one). SIM mobile-internet).
• 🔄 After extraction SIM-Smartphone card may require reboot for correct microSD recognition.

Also check if the card is not important data, if the card was previously used on another device, it will have to be formatted, which will lead to the deletion of all files, and we recommend that you copy the data to the computer in advance.

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If you plan to use the card as internal memory, make a backup of the data of the smartphone, and when formatted in this mode, all files on the card will be encrypted and will become unavailable on other devices.

3. Step-by-step instructions: how to insert a memory card in Redmi 9

Now, to the installation process itself, follow the instructions carefully so that you don't damage the slot or the card:

1. Remove the tray for SIM-Use a paper clip or a special key (complete with your smartphone) insert it into the hole on the top of your smartphone (near the power button) and press it slightly until the tray is pushed out.
2. Place the memory card. 📁 The map should be placed with gold contacts down. 🔄 If you use one of them SIM-map, place it in the slot SIM 1, and microSD is in the slot SIM 2. ⚠️ Don't make an effort, the map should come in easily. If you feel resistance, check your orientation.

Put the tray back in.

Turn on your smartphone.

If the memory card notification doesn’t appear after you turn on, go to Settings → Memory and check if it shows up in the External Memory section. If not, retrieve the card and repeat the procedure.

Make sure the card is recognized in the Settings|Check the free space on the map|Format the card (if required)|Transfer files from internal memory (optional)-->

Important: if you inserted a card, but the smartphone does not see it, the following reasons are possible:

• 🔌 The card is not inserted to the end or turned over.
• 🛠️ Slot damaged (check for dirt or deformation).
• 🗑️ The map is formatted in NTFS or other incompatible file system.

4. Memory card formatting: FAT32 vs exFAT

After the first connection, Redmi 9 can offer to format the card, and it is important to choose the right file system:

How to format a card directly in a smartphone:

1. Go to Settings → Memory → Memory Map.
2. Click Format (or Configure if the card is new).
3. Choose exFAT for cards from 64GB or FAT32 for cards up to 32GB.
4. Confirm the action. It'll take 1-2 minutes.

⚠️ Note: Formatting will delete all the data on the map! If it had files on it, pre-copy them to the computer or cloud.

If you plan to use the card as internal memory (for installing applications), the smartphone will automatically format it into an encrypted format Ext4 or F2FS. This process is irreversible - after such formatting, the card will not be read on other devices.

5. Set up a memory card as an internal drive

One of the key benefits of Redmi 9 is that it can use microSD as internal memory, allowing you to install applications directly on the map, freeing up space in the built-in storage, but it has some nuances:

• ⚡ The card must be high speed (class) A1 or A2), Otherwise, the app will be slowed down.
• 🔒 After setting up the card will be encrypted and will work only on this smartphone.
• 📉 MicroSD application performance is lower than in internal memory (even with cards) A2).

How to set up a card as an internal memory:

1. After inserting the card, go to Settings → Memory → Memory Map.
2. Click Set up (or use as internal memory).
3. Confirm the formatting. It can take up to 10 minutes.
4. After completion, the smartphone will offer to transfer data (photos, videos, some applications) to the map.

⚠️ Note: If you retrieve a card configured as internal memory, some applications may stop working. Always use Safe Retrieval in your memory settings.

To return the card to portable storage mode, it will have to be formatted again (with loss of all data). To do this, go to Settings → Memory → Memory Map → Format as a portable drive.

6. Transfer data and applications to a memory card

Once you've set up the map, you can transfer files and applications to it. Here's how to do it effectively:

Transfer of files (photos, videos, music)

The easiest way is to use the built-in File Manager:

1. Open the File Manager (or File Manager) application.
2. Go to the Internal Memory section and select the files for transfer.
3. Click Move and select Memory Map as your target folder.

To automatically save new photos and videos to the map:

1. Open the camera → Settings (cog icon).
2. Find the option Memory to save and select Memory Map.

Portability of applications

Not all applications can be transferred to the map. System programs and some games (such as PUBG Mobile or Genshin Impact) remain in internal memory.

1. Go to Settings → Applications → Application Management.
2. Select the app and click Storage.
3. If the option to Change is available, click it and select the Memory Card.

⚠️ Note: Moving apps to a map can reduce their performance, especially if the class map is lower A1. Some functions (such as widgets) may also stop working.

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For maximum performance, use the card as an external drive for files (photos, videos, music), and leave applications in internal memory. Only transfer to the microSD programs that are not critical to speed.

Typical problems and their solutions

Even after installing the memory card correctly, Redmi 9 can still have errors, and let’s look at the most common ones and how to fix them:

If the card stopped being defined after the firmware update, try the following steps:

1. Reboot your smartphone.
2. Remove and re-insert the map.
3. Check if the slot is disabled in the settings: Settings → SIM-cards and mobile networks → Additional → Slot for the memory card.

If nothing helps, try formatting the card on your computer using the utility. SD Card Formatter (official software from the SD This often solves problems with unreadable cards.

8. Tips for optimizing work with a memory card

To keep the memory card in Redmi 9 running fast and long, follow these guidelines:

• 🔄 Regularly format the map (every 3-6 months) to avoid fragmentation of files.
• 📱 Do not remove the card while recording data (for example, when shooting a video or copying files).
• 🛡️ Use a cover with slot protection - this will prevent dust and moisture from entering.
• 📊 Control the free space – when filling the card by more than 90%, the write speed drops.

If you shoot video in Full HD or 4K often, choose cards with high speed recording (for example, SanDisk Extreme labeled V30 or V60), which will prevent the video from shaking when recording.

For advanced users: if the card is used as internal memory, you can improve performance by disabling animations in the developer settings.

1. Activate Developer Mode: Settings → About Phone → MIUI version (click 7 times).
2. Back to Settings → Additionally. → For developers.
3. Find options Animation Scale, Transition Animation and Animator Duration – set the value Off.

This will reduce the load on the memory card when you start applications.

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If you use the card as internal memory, reboot your smartphone once a month, which clears the cache and prevents applications installed on the microSD from slowing down.

FAQ: Frequent questions about memory cards in Xiaomi Redmi 9