I'm trying to reset this USB drive so that I can use the 64.2 GB of space. I've tried diskutil unmount and it didn't work.

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  • a few more details would be good. What happens if youtry and delete the partition in Disk Utility? Or just format it as HFS+ or APFS? – Steve Chambers Feb 12 at 21:06
  • The "FDisk_partition_scheme" isn't really taking up space, it's indicating that you have a 64.2GB disk formatted with the "FDisk" (aka MBR) partition scheme. The space within that is available for use as volumes, but most of it is empty. Mind you, you might want to switch to a different partition scheme (probably GPT), but then it's going to say "GUID_partition_scheme *64.2 GB". – Gordon Davisson Feb 12 at 21:31

I fiqured it out. I used this:

diskutil eraseDisk JHFS+ Emptied /dev/disk3

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