Question: Disk Utility cannot erase USB Drive
I'm trying to reformat a USB thumbdrive that I'd previously been using as a Linux boot device.
Unfortunately Disk Utility cannot erase the device.
When I insert the drive, I get a warning that it's not readable:
So I click "Initialize..." which launches Disk Utility. In here, it shows up as "disk4s2" (the disk number can vary if I try a different MacOs device), which doesn't look right to me.
When I try to erase the drive, I get the error "Couldn't modify partition map."
There's no write-protect switch on the thumbdrive. How can I fix this?
iMac with Retina 5K display, macOS High Sierra (10.13), 4GHz Intel i7, 32GB RAM, 3TB Fusion