Open the computer case and remove the data cable from the hard drive. To check to see if this is the cause of the BIOS not detecting the hard drive, follow these steps: Power off the computer. there are of course other filesystems available. Drive is not spinning up If the drive is not receiving power or receiving an incorrect level of power, it will not spin up. there are of course other filesystems available. I decided to use ExFAT, and name the drive USB64:ĭiskutil eraseDisk ExFAT USB64 /dev/disk4Ģ: Microsoft Basic Data USB64 62.5 GB disk4s2Īnd now I have a fully working USB drive again! At this stage, you won't see it showing in the Disk Utility program, but fortunately formatting it is trivial. it now has a partitioning scheme MacOs can work with. To erase the device completely, I just ran: I think the problem is the partitioning scheme. My USB drive shows up in "diskutil list" as: ![]() ![]() ![]() Found the answer - diskutil at the command line.
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