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4TB SanDisk Extreme SSD not mounting on macOS Ventura

I recently bought two 4TB SanDisk Extreme SSDs, but both of them stopped mounting after some time. I've tried troubleshooting steps like upgrading macOS and formatting them in APFS or Mac OS Extended (Journaled) format to no avail. No matter which format they are formatted with, they will just randomly stop mounting after two or three uses. Selecting the drive and click the Mount button doesn't work as well. What should I do?

Best Answered by

Jenny Zeng

Answered on Tuesday, August 27, 2024

Your 4TB SanDisk Extreme SSDs are likely affected by firmware issues, faulty USB cable/port, or hardware problems.

Western Digital has discovered a firmware issue that can cause certain SanDisk Extreme Portable SSDs to unexpectedly disconnect from a computer. To check if your model is affected, you can visit their website and enter your drive's serial number.

If your drive is indeed impacted by the firmware issue, you can update the firmware to resolve it.

If not, you need to pay attention to the connections. Try a different USB cable or port, directly connect the drive to your Mac, or use your SSDs on a different Mac to see if they can mount properly persistently. If it continues to have mount problems, you should consider returning them and getting new ones.

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