SD Card Unmounted: 5 Fixes for Unmountable SD Card and Data Recovery

TL;DR:

To resolve an unmountable SD card without losing data, first extract your files using a recovery tool like Wondershare Recoverit, then repair the file system using Windows utility commands or a complete format.
    ● Run `chkdsk X: /f /r` (replacing X with your SD card drive letter) in an administrator Command Prompt to identify and repair logical file system errors or bad sectors.
    ● Format the SD card to FAT32 or exFAT only as a last resort to rebuild a corrupted file system, keeping in mind that this process will erase all data currently on the card.
    ● Stop the card from repeatedly unmounting by disabling power management settings for the card reader, updating Device Manager drivers, and cleaning the gold contacts with isopropyl alcohol.

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An SD card can become unmountable because of a loose connection, failed reader, unsupported host, damaged file system, or physical card failure. A card that appears and disappears, shows as RAW, or is visible only in a disk utility needs a different response from a card that no device detects.

If the card contains important photos, videos, or documents, stop writing to it before running CHKDSK, formatting, initializing, or repeatedly reconnecting it. First test the reader and card, then recover files while the storage is still detectable. Repair the empty or backed-up card afterward.

Note: If the card is hot, cracked, wet, repeatedly disconnects, or is not detected by any known-good reader or device, stop DIY repair attempts and consider professional recovery.

Part 1: What Does an Unmountable SD Card Mean?

An unmountable SD card is a card that the operating system can detect only partially or cannot attach as a usable volume. It may appear in a disk utility but not in the file browser, appear as RAW, disconnect repeatedly, or fail to appear at all.

Which Recovery Path Fits Your Unmountable SD Card?

Part 2: Why Is an SD Card Unmountable?

Part 3: Recover Data From an Unmountable SD Card With Recoverit

Use Recoverit when the SD card is still detectable but files are deleted, missing, formatted, or inaccessible. It can scan a memory card through a stable reader and help locate common photos, videos, documents, and other files. It cannot repair a broken reader or scan a card that no device detects.

1. Connect the card: Use a stable reader and avoid an unreliable hub or damaged adapter.
2. Select the source: Open Recoverit and choose the SD card by checking its name and capacity.

   

3. Start the scan: Let the scan search for deleted or lost files.

   

4. Filter and preview: Use file type, path, date, name, or size filters and preview the results when available.

   

5. Recover elsewhere: Click Recover and save the files to the computer or another healthy drive.

   

Note: Do not save recovered files back to the unmountable card. New writes can overwrite other recoverable data.

Part 4: Fix an SD Card That Keeps Unmounting

Run these fixes only after copying or recovering important files. If the card is still unstable, stop at the connection checks and consider professional recovery.

Fix 1: Check the Card, Adapter, and Reader

1. Power off the camera or device when its instructions require it.
2. Remove the card and inspect the body and contacts for cracks, corrosion, moisture, or bending.
3. Try another compatible adapter, card reader, USB port, and computer.
4. Test a known-good card in the original reader to separate reader failure from card failure.

Fix 2: Update or Reinstall the Reader Driver

1. Open Device Manager and expand Disk drives, Memory technology devices, or Universal Serial Bus controllers.
2. Right-click the reader and choose Update driver.
3. If needed, choose Uninstall device, restart Windows, and let Windows reinstall it.

Fix 3: Assign a Drive Letter When the Volume Is Usable

1. Open Disk Management.
2. Right-click the correct usable SD card volume and choose Change Drive Letter and Paths.
3. Choose Add or Change, then select an unused letter.

Fix 4: Run CHKDSK Only After Recovery

Use chkdsk X: /f only when the card has a drive letter and important files are already safe. CHKDSK can modify file-system metadata and is not an undelete tool.

Fix 5: Format Only After Recovery

Formatting erases the volume. Use it only when important files are backed up or recovered and the card remains unusable. Choose a file system supported by the device that will use the card.

Note: Do not run CHKDSK or format a card that still contains unrecovered files. Recovery comes before repair.

Bonus Video Tutorial: How to Fix SD Card Not Showing Or Recognized on Windows 10/11

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Part 5: Prevent Repeated SD Card Unmounting

1. Eject safely: Let camera writes and transfers finish before removing the card.
2. Keep the connection stable: Replace loose adapters, unreliable readers, and damaged ports.
3. Use a supported card: Check the host device's supported capacity, card generation, and file system.
4. Back up important files: Keep copies on a computer, external drive, or cloud storage.
5. Keep contacts clean and dry: Store the card in a protective case and avoid forcing it into a slot.
6. Retire unstable cards: A card that repeatedly unmounts, becomes RAW, or corrupts files should not hold the only copy of important data.

Conclusion

Recovering data from an unmountable SD card starts with protecting the card and identifying where it is still visible. Test the reader, adapter, port, and device. If the card is detectable but files are missing or the volume will not mount, recover the data before CHKDSK or formatting.

If the card is hot, physically damaged, repeatedly disconnects, or is invisible in every known-good device, stop repeated software attempts and consider professional recovery. After the files are safe, replace a card that continues to unmount or corrupt data.