This will destroy any data on /dev/sda3 Discarding device contents (may take a while on large devices): Done Adding journals: Done Building resource groups: Done Creating quota file: Done Writing superblock and syncing: Done Device: /dev/sda3 Block size: 4096 Device size: 20.00 GB (5242880 blocks) Filesystem size: 20.00 GB (5242879 blocks) Journals: 1 Journal size: 128MB Resource groups: 81 Locking protocol: "lock_nolock" Lock table: "" UUID: 4d6c8e71-edf6-4df8-80e4-292313a268bb