If SSD is new and it is not showing up, you can't see the partitions of the SSD in Disk Utility, but you receive a message "the disk you inserted was not readable by this computer". In this case, ensure you do not have any data on this drive and then initialize it in Disk Util...
See if your SanDisk SSD is affected by this known firmware issue (I think it only affects more recent 2TB & 4TB SanDisk Extreme SSDs though): https://support-en.wd.com/app/answers/detailweb/a_id/50763/~/sandisk-extreme-portable-ssd-v2%2C-sandisk-extreme-pro-portable-ssd-v2%2C-and-w...
SanDisk Extreme Pro Portable SSD Not Detected ReasonsBefore learning the detailed solution, you'd better know why this issue happens. Multiple reasons can cause SanDisk Extreme Pro Portable SSD not to be detected on your PC:File system corruption. That can be the most likely cause of the ...
Sandisk Extreme Portable SSD 说明书
how to connect ipad 6th generation to SanDisk 500GB Extreme Portable SSD? 2 years ago 878 4 Sandisk SSD not working with IOS 14 or iPad IOS I'm trying to connect my 1TB Sandisk to my iPad or iPhone (both running IOS14). The drive won't show up under Files. I'm connecting it...
How to Fix SanDisk Extreme Pro SSD Not Recognized or Detected on macOS Fix 1: Make Sure the SSD is Properly Connected Fix 2: Check the USB Cable Fix 3: Restart your Mac Fix 4: Use Disk Utility to Check the SSD Fix 5: Use First Aid to Fix the SSD ...