How to allow access SD-Xiaomi Mi 9 map: all ways + mistake-making

Xiaomi Mi 9 owners often face a problem when the smartphone does not see SD-This can happen after the card is updated or blocked. MIUI, When you reset your settings or when you first connect a new drive, 80 percent of the time, it's software-based, without having to bring your phone to a service center.

The main reasons for blocking SD-Mi 9 cards: Incorrect formatting (especially if the card has been used in other devices), file system conflict (FAT32 vs exFAT), or system limitations MIUI, In this article, we will discuss all the working methods, from basic settings to hidden developer functions, that will help you regain full control of the external drive.

It is important to consider that Xiaomi Mi 9 supports memory cards up to 256 GB with a file system. FAT32 Or exFAT, but some firmware may require forced formatting over the phone. SD-map, and the system suggests formatting it - do not ignore this message, otherwise you risk losing access to the data.

1. Verification of physical connection SD-map

Before you change the settings, make sure the problem isn't mechanical contact.On Xiaomi Mi 9 slot for the game SD-maps are combined with a tray for SIM-cards (hybrid slot nanoSIM) + If the memory card is inserted incorrectly or the tray is deformed, the phone will not detect it.

How to check:

• ✅ Remove the tray with a paper clip (the hole next to the slot).
• ✅ Make sure that SD-The map is placed with gold contacts down and fixed with a latch.
• ✅ Blow the dust slot (you can use a can of compressed air).
• ✅ Try pasting the card into another device (laptop, other phone) – if it doesn’t read there, the problem is with the card itself.

⚠️ Note: Do not use metal objects to remove the tray, except for a special clip. needles or pins can damage the fixation mechanism.

If the card is detected on a PC but not on Mi 9, go to software methods. If not, check the card for physical damage or replace it. SD-Xiaomi Mi 9 cards do not support the standard UHS-III, This means that cards with this marking may not work smoothly.

2. Configuring access to SD-map MIUI

By default, MIUI can block the recording to external drives for some applications, to allow full access:

1. Open the Settings → Memory.
2. Tap your name on it. SD-maps (e.g. SanDisk) 128GB).
3. Select Settings → Format as internal memory (if you want to use the card as an extension of the main memory) or Format as portable (if the card will be used as a removable drive).
4. Confirm the action. Attention: formatting will remove all data from the map!

If the formatting option is not available:

• 🔄 Reboot the phone.
• 📱 Check if the charge saving mode is enabled (it may restrict access to the drives).
• 🔧 Update the firmware to the latest version MIUI (In the old versions there were bugs with work. SD-map).

Once formatted, the map should appear in the Memory section and be available for recording. If that doesn't happen, move on to the next step.

3. Access permission for applications

Even if SD-The card is defined by the system, individual applications (such as a gallery or file managers) may not have the rights to write:

1. Open Settings → Applications → Permissions → Application Permissions.
2. Select the application you want to access (such as Gallery or Files).
3. Slip on the memory and switch on Allow access to SD-map.

Some apps (such as Google Photos or WhatsApp) may need to be customized further:

• 📁 In the application settings, find the Memory or Storage section.
• 🔄 Choose. SD-map as default save location.
• ⚙️ If the option is not available, try reinstalling the app.

⚠️ Note: Some apps (such as Netflix or Spotify) do not support data retention on a basic basis. SD-The card is a security policy, and in this case, the transfer is only possible through manual copying of files.

1. Open the settings of a particular application

2. Check the "Memory" or "Storage" section

3. Enable access to SD-permit-card MIUI

4. Restart the annex-->

4. Formatting SD-cards via PC (if) MIUI refuse)

If the Xiaomi Mi 9 persists in not formatting the map, you can do it through your computer.

• 💾 FAT32 — Compatible with all devices, but does not support files >4GB.
• 💾 ExFAT is the best option for SD-map >64GB supports large files.
• 💾 NTFS — Not recommended for Android (may not be readable).

Instructions for Windows:

1. Connect. SD-card to PC via card reader.
2. Open this computer, right-click on SD-map → Format.
3. Select the exFAT file system (or FAT32 if the card is <64GB).
4. Click Start and wait until it is completed.

For macOS or Linux, use Disk Utility or mkfs, respectively. After formatting, paste the card back into Mi 9 and check for detection.

5. Error Correction through Recovery and Fastboot modes

If SD-The card is not determined even after formatting, the problem can be hidden in the system settings of the Mi 9. In this case, a cache reset or a complete reset via Recovery will help.

How to reset the cache:

1. Turn off the phone.
2. Press Power + Volume up until the Mi logo appears.
3. From the Recovery menu, select Wipe & Reset → Wipe Cache.
4. Confirm the action and restart the phone.

If that doesn't work, try resetting to factory-based Wipe All Data, but note that all internal memory data will be deleted. Back up before you do that!

For advanced users: If the problem occurred after the MIUI update, you can roll back to the previous version via Fastboot.

• 🖥️ Install Mi Flash Tool on PC.
• 📥 Download the required firmware version for Mi 9 (codename cepheus).
• 🔌 Connect your phone to Fastboot (Power) + Loudness down).

⚠️ Note: Firmware rollback can cause the bootloader to be blocked if the phone has been unblocked. Use this method only if you are confident in your actions.

Verification of compatibility SD-cards from Xiaomi Mi 9

Not all. SD-The cards work equally well with the Xiaomi Mi 9. Here's the compatibility table of popular models:

If your card is not on the list, pay attention to its speed class. To record video in 4K on the Mi 9 requires a card at least below UHS-I U3 or V30. Class 4/6 cards can work unstable.

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Before the purchase SD-Check it for counterfeit with the help of the utility H2testw (Windows or F3 (macOS/Linux). Fake cards often have an understated speed and the actual volume is less than the stated value.

7. Solving Reading Error Problems SD-map

If SD-The card is defined but gives errors when reading/write (e.g, "SD-Card damaged" or "Lack of memory" try the following methods:

• 🔍 Error Check: Connect the card to the PC. Open the Properties → Service → Check (Windows) Select to check and repair damaged sectors.
• 🔄 Change the letter of the disk: in Disk Management (Win) + X. Find yours. SD-Right-click on the map. → Change the letter of the disk. Assign a new letter (e.g., G:) and reconnect the card to the phone.

SD Card Formatter

:

1. Download the official SD Card Formatter utility.
2. Select Overwrite format and start the process.

If the card still doesn't work, try testing it on another device, and if it's a recurring error, the drive is damaged and must be replaced.

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Never take it out. SD-A card from Xiaomi Mi 9 while recording data (e.g., while shooting videos or copying files) can damage the file system and completely lose access to the card.

FAQ: Frequent questions about SD-maps on Xiaomi Mi 9