I have a flash drive which was formatted on Mac using the Disk Utility. But when I'm trying to replug the drive it shows up in disk utility but says Not Mounted. I'm unable to erase as it says
Unmounting disk Erasing Couldn't open device. Operation failed...
It is not visible in the finder.
I also have tried formatting it from terminal using
diskutil eraseDisk free EMPTY /dev/disk2
but this stops with following error:
Started erase on disk2 Unmounting disk Creating the partition map Error: -69877: Couldn't open device
Also have tried this link but it also failed with error:
Started partitioning on disk2 Unmounting disk Creating the partition map Error: -69877: Couldn't open device (Is a disk in use by a storage system such as AppleRAID, CoreStorage, or APFS?)
After an exhausted online search and trials I'm posting here.
Thanks in Advance