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Get drive name
diskutil list
then try
diskutil unmountDisk force /dev/DRIVENAME
Then format
diskutil eraseDisk JHFS+ Emptied /dev/DRIVENAME
or
diskutil eraseDisk FAT32 EmptiedNEWNAME /dev/DRIVENAME
diskutil eraseDisk FAT32 Emptied /dev/DRIVENAME
diskutil eraseDisk FAT32 NEWNAME /dev/DRIVENAME
diskutil eraseDisk FAT32 DRIVENAMEEmptied /dev/disk1DRIVENAME
diskutil eraseDisk FAT32 DRIVENAME /dev/disk1