diskutil umount force disk0s1
diskutil info /
-bash-3.2# diskutil info /
Device Identifier: disk0s1
Device Node: /dev/disk0s1
Whole: No
Part of Whole: disk0
Volume Name: OS X Base System
Mounted: Yes
Mount Point: /
Partition Type: Apple_HFS
File System Personality: HFS+
Type (Bundle): hfs
Name (User Visible): Mac OS Extended
Owners: Enabled
OS Can Be Installed: No
Media Type: Generic
Protocol: PCI-Express
SMART Status: Not Supported
Volume UUID: B0B6F31E-31D1-3171-80D6-584A9F480FA2
Partition Offset: 8192 Bytes (2 4096-Byte-Device-Blocks)
Disk Size: 121.3 GB (121332817920 Bytes) (exactly 236978160 512-Byte-Units)
Device Block Size: 4096 Bytes
Volume Total Space: 121.3 GB (121332817920 Bytes) (exactly 236978160 512-Byte-Units)
Volume Used Space: 1.5 GB (1539190784 Bytes) (exactly 3006232 512-Byte-Units) (1.3%)
Volume Free Space: 119.8 GB (119793627136 Bytes) (exactly 233971928 512-Byte-Units) (98.7%)
Allocation Block Size: 4096 Bytes
Read-Only Media: No
Read-Only Volume: Yes
Device Location: Internal
Removable Media: Fixed
Solid State: Yes
Hardware AES Support: No
-bash-3.2#
Volume Total Space: 121.3 GB
diskutil list
-bash-3.2# diskutil list
/dev/disk0 (internal):
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme 121.3 GB disk0
1: Apple_HFS OS X Base System 121.3 GB disk0s1
/dev/disk1 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme +2.1 GB disk1
1: Apple_HFS OS X Base System 2.0 GB disk1s1
/dev/disk2 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: untitled +5.2 MB disk2
/dev/disk3 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: untitled +524.3 KB disk3
/dev/disk4 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: untitled +524.3 KB disk4
/dev/disk5 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: untitled +524.3 KB disk5
/dev/disk6 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: untitled +2.1 MB disk6
/dev/disk7 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: untitled +524.3 KB disk7
/dev/disk8 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: untitled +524.3 KB disk8
/dev/disk9 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: untitled +12.6 MB disk9
/dev/disk10 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: untitled +4.2 MB disk10
/dev/disk11 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: untitled +1.0 MB disk11
/dev/disk12 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: untitled +2.1 MB disk12
/dev/disk13 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: untitled +524.3 KB disk13
/dev/disk14 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: untitled +524.3 KB disk14
/dev/disk15 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: untitled +1.0 MB disk15
/dev/disk16 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: untitled +6.3 MB disk16
/dev/disk17 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: untitled +6.3 MB disk17
/dev/disk18 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: untitled +524.3 KB disk18
/dev/disk19 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: untitled +2.1 MB disk19
-bash-3.2#
diskutil eraseDisk jhfs+ "Macintosh HD" gpt disk0
-bash-3.2# diskutil eraseDisk jhfs+ "Macintosh HD" gpt disk0
Started erase on disk0
Unmounting disk
Creating the partition map
Waiting for partitions to activate
Formatting disk0s2 as Mac OS Extended (Journaled) with name Macintosh HD
Initialized /dev/rdisk0s2 as a 113 GB case-insensitive HFS Plus volume with a 16384k journal
Mounting disk
Finished erase on disk0
-bash-3.2#