-bash-3.2# diskutil list /dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *256.1 GB disk0 1: EFI 209.7 MB disk0s1 2: Apple_HFS HD256 189.4 GB disk0s2 3: Microsoft Basic Data bootcamp 65.5 GB disk0s3 /dev/disk1 #: TYPE NAME SIZE IDENTIFIER 0: Apple_partition_scheme *1.4 GB disk1 1: Apple_partition_map 30.7 KB disk1s1 2: Apple_Driver_ATAPI 2.0 KB disk1s2 3: Apple_HFS Mac OS X Base System 1.4 GB disk1s3 /dev/disk2 #: TYPE NAME SIZE IDENTIFIER 0: untitled *524.3 KB disk2 /dev/disk3 #: TYPE NAME SIZE IDENTIFIER 0: untitled *524.3 KB disk3 /dev/disk4 #: TYPE NAME SIZE IDENTIFIER 0: untitled *524.3 KB disk4 /dev/disk5 #: TYPE NAME SIZE IDENTIFIER 0: untitled *524.3 KB disk5 /dev/disk6 #: TYPE NAME SIZE IDENTIFIER 0: untitled *524.3 KB disk6 /dev/disk7 #: TYPE NAME SIZE IDENTIFIER 0: untitled *6.3 MB disk7 /dev/disk8 #: TYPE NAME SIZE IDENTIFIER 0: untitled *2.1 MB disk8 /dev/disk9 #: TYPE NAME SIZE IDENTIFIER 0: untitled *1.0 MB disk9 /dev/disk10 #: TYPE NAME SIZE IDENTIFIER 0: untitled *524.3 KB disk10 /dev/disk11 #: TYPE NAME SIZE IDENTIFIER 0: untitled *524.3 KB disk11 /dev/disk12 #: TYPE NAME SIZE IDENTIFIER 0: untitled *1.0 MB disk12 -bash-3.2# diskutil info disk0s2 Device Identifier: disk0s2 Device Node: /dev/disk0s2 Part of Whole: disk0 Device / Media Name: HD256 Volume Name: HD256 Escaped with Unicode: HD256 Mounted: No File System Personality: Journaled HFS+ Type (Bundle): hfs Name (User Visible): Mac OS Extended (Journaled) Journal: Unknown (not mounted) Owners: Disabled Partition Type: Apple_HFS OS Can Be Installed: No Media Type: Generic Protocol: SATA SMART Status: Verified Volume UUID: F6B7DBD0-27A0-3645-BD9D-130D66DBE2EF Total Size: 189.4 GB (189410664448 Bytes) (exactly 369942704 512-Byte-Blocks) Volume Free Space: 0 B (0 Bytes) (exactly 0 512-Byte-Blocks) Device Block Size: 512 Bytes Read-Only Media: No Read-Only Volume: Not applicable (not mounted) Ejectable: No Whole: No Internal: Yes Solid State: Yes -bash-3.2# diskutil eraseVolume jhfs+ "HD256" disk0s2 Started erase on disk0s2 HD256 Unmounting disk Erasing Initialized /dev/rdisk0s2 as a 176 GB HFS Plus volume with a 16384k journal Mounting disk Could not mount disk0s2 with name HD256 after erase Finished erase on disk0s2 HD256 -bash-3.2#