-bash-3.2# diskutil eraseVolume jhfs+ "Macintosh HD" disk1s2
Started erase on disk1s2
Unmounting disk
Erasing
newfs_hfs: WriteBuffer: pwrite(3, 0x1089b0000, 1048576, 4096): Input/output error
newfs_hfs: write (sector 8): Invalid argument
Mounting disk
Could not mount disk1s2 after erase
Error...