diskutil list #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                  Apple_HFS Macintosh HD            999.3 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
/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 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *61.8 GB    disk2
   1:                        EFI EFI                     209.7 MB   disk2s1
   2:                  Apple_HFS Install macOS High S... 61.5 GB    disk2s2
/dev/disk3 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +5.2 MB     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               +524.3 KB   disk6
/dev/disk7 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +2.1 MB     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               +524.3 KB   disk9
/dev/disk10 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +12.6 MB    disk10
/dev/disk11 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +4.2 MB     disk11
/dev/disk12 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +1.0 MB     disk12
/dev/disk13 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +2.1 MB     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               +524.3 KB   disk15
/dev/disk16 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +1.0 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               +6.3 MB     disk18
/dev/disk19 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk19
/dev/disk20 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +2.1 MB     disk20
/dev/disk21 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     FDisk_partition_scheme                        *1.0 TB     disk21
   1:                  Apple_HFS PHILIPPE 2              1.0 TB     disk21s1
-bash-3.2#diskutil eraseDisk jhfs+ Clone gpt disk21-bash-3.2# diskutil eraseDisk jhfs+ Clone gpt disk21
Started erase on disk21
Unmounting disk
Creating the partition map
Waiting for partitions to activate
Formatting disk21s2 as Mac OS Extended (Journaled) with name Clone
Initialized /dev/rdisk21s2 as a 931 GB case-insensitive HFS Plus volume with a 81920k journal
Mounting disk
Finished erase on disk21
-bash-3.2#caffeinate -dimsu &cp -av /Volumes/"Macintosh HD"/* /Volumes/Clone-bash-3.2# df -H
Filesystem      Size   Used  Avail Capacity iused      ifree %iused  Mounted on
/dev/disk1s1    2.0G   1.3G   715M    65%   45155 4294922124    0%   /
devfs           209k   209k     0B   100%     708          0  100%   /dev
/dev/disk3      5.2M   1.7M   3.5M    34%      22 4294967257    0%   /private/var/log
/dev/disk4      524k   147k   377k    29%       7 4294967272    0%   /Volumes
/dev/disk5      524k   147k   377k    29%       7 4294967272    0%   /private/var/tmp
/dev/disk6      524k   160k   365k    31%      12 4294967267    0%   /private/var/run
/dev/disk7      2.1M   143k   2.0M     7%       2 4294967277    0%   /private/tmp
/dev/disk8      524k   147k   377k    29%       3 4294967276    0%   /System/Installation
/dev/disk9      524k   311k   213k    60%      22 4294967257    0%   /private/var/db
/dev/disk10      13M   5.1M   7.4M    41%      81 4294967198    0%   /private/var/folders
/dev/disk11     4.2M   4.0M   180k    96%     325 4294966954    0%   /private/var/root/Library
/dev/disk13     2.1M   143k   2.0M     7%       2 4294967277    0%   /private/var/root/Library/Containers
/dev/disk14     524k   184k   340k    36%      11 4294967268    0%   /Library/Preferences
/dev/disk15     524k   164k   360k    32%       6 4294967273    0%   /Library/Preferences/SystemConfiguration
/dev/disk16     1.0M   184k   864k    18%       6 4294967273    0%   /Library/Keychains
/dev/disk17     6.3M   176k   6.1M     3%       2 4294967277    0%   /private/var/tmp/RecoveryTemp
/dev/disk18     6.3M   176k   6.1M     3%       2 4294967277    0%   /private/var/tmp/OSISPredicateUpdateProductTemp
/dev/disk19     524k   143k   381k    28%       2 4294967277    0%   /private/var/tmp/InstallerCookies
/dev/disk20     2.1M   143k   2.0M     7%       2 4294967277    0%   /Library/Logs/DiagnosticReports
/dev/disk2s2     62G   5.5G    56G     9%    1079 4294966200    0%   /Volumes/Install macOS High Sierra
/dev/disk0s3    650M   540M   103M    84%      18 4294967261    0%   /Volumes/Image Volume
/dev/disk0s2    999G   568G   431G    57% 1388961 4293578318    0%   /Volumes/Macintosh HD
/dev/disk21s2   1000   577G   423G    58% 1278316 4293688963    0%   /Volumes/Clone
-bash-3.2#diskutil eraseVolume jhfs+ "Macintosh HD" disk0s2-bash-3.2# caffeinate -dimsu &
[1] 768
-bash-3.2# diskutil eraseVolume jhfs+ "Macinstosh HD" disk0s2
Started erase on disk0s2 Macintosh HD
Unmounting disk
Erasing
Initialized /dev/rdisk0s2 as a 931 GB case-insensitive HFS Plus volume with a 81920k journal
Mounting disk
Finished erase on disk0s2 Macinstosh HD
-bash-3.2# 
	