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Je viens d'y jeter un œil : tu as des Disques Durs Externes USB de 4 To à moins de 100€ sur Amazon.
	
		
			
		
		
	
				
			diskutil list-bash-3.2# diskutil list
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *3.0 TB     disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage Macintosh HD            3.0 TB     disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
/dev/disk1 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *121.3 GB   disk1
   1:                        EFI EFI                     209.7 MB   disk1s1
   2:          Apple_CoreStorage Macintosh HD            121.0 GB   disk1s2
   3:                 Apple_Boot Boot OS X               134.2 MB   disk1s3
/dev/disk2 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        +2.1 GB     disk2
   1:                  Apple_HFS OS X Base System        2.0 GB     disk2s1
/dev/disk3 (internal, virtual):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Macintosh HD           +3.1 TB     disk3
                                 Logical Volume on disk1s2, disk0s2
                                 EB00423F-F400-44C0-985A-F0585338FCE5
                                 Unencrypted Fusion Drive
/dev/disk4 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +5.2 MB     disk4
/dev/disk5 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *5.0 TB     disk5
   1:                        EFI EFI                     209.7 MB   disk5s1
   2:                  Apple_HFS WD_5TO_USB3_MacOSEJ     5.0 TB     disk5s2
/dev/disk6 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   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               +2.1 MB     disk9
/dev/disk10 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk10
/dev/disk11 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk11
/dev/disk12 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +12.6 MB    disk12
/dev/disk13 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +4.2 MB     disk13
/dev/disk14 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +1.0 MB     disk14
/dev/disk15 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +2.1 MB     disk15
/dev/disk16 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk16
/dev/disk17 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk17
/dev/disk18 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +1.0 MB     disk18
/dev/disk19 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +6.3 MB     disk19
/dev/disk20 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +6.3 MB     disk20
/dev/disk21 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +524.3 KB   disk21
/dev/disk22 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                            untitled               +2.1 MB     disk22
-bash-3.2#diskutil rename disk5s2 Clonecaffeinate -dimsu &cp -av /Vol*/Mac*/* /Vol*/Clonedf -H-bash-3.2# df -H
Filesystem     Size   Used  Avail Capacity iused      ifree %iused  Mounted on
/dev/disk2s1   2.0G   1.3G   720M    64%   45162 4294922117    0%   /
devfs          212k   212k     0B   100%     716          0  100%   /dev
/dev/disk4     5.2M   5.2M     0B   100%      54 4294967225    0%   /private/var/log
/dev/disk6     524k   147k   377k    29%       5 4294967274    0%   /Volumes
/dev/disk7     524k   156k   369k    30%       8 4294967271    0%   /private/var/tmp
/dev/disk8     524k   156k   369k    30%      11 4294967268    0%   /private/var/run
/dev/disk9     2.1M   143k   2.0M     7%       2 4294967277    0%   /private/tmp
/dev/disk10    524k   143k   381k    28%       2 4294967277    0%   /System/Installation
/dev/disk11    524k   307k   217k    59%      21 4294967258    0%   /private/var/db
/dev/disk12     13M   4.3M   8.3M    34%      76 4294967203    0%   /private/var/folders
/dev/disk13    4.2M   3.9M   295k    93%     304 4294966975    0%   /private/var/root/Library
/dev/disk15    2.1M   143k   2.0M     7%       2 4294967277    0%   /private/var/root/Library/Containers
/dev/disk16    524k   180k   344k    35%      11 4294967268    0%   /Library/Preferences
/dev/disk17    524k   160k   365k    31%       5 4294967274    0%   /Library/Preferences/SystemConfiguration
/dev/disk18    1.0M   176k   872k    17%       6 4294967273    0%   /Library/Keychains
/dev/disk19    6.3M   176k   6.1M     3%       2 4294967277    0%   /private/var/tmp/RecoveryTemp
/dev/disk20    6.3M   176k   6.1M     3%       2 4294967277    0%   /private/var/tmp/OSISPredicateUpdateProductTemp
/dev/disk21    524k   143k   381k    28%       2 4294967277    0%   /private/var/tmp/InstallerCookies
/dev/disk22    2.1M   143k   2.0M     7%       2 4294967277    0%   /Library/Logs/DiagnosticReports
/dev/disk5s2   5.0T   3.1T   1.9T    63% 3179850 4291787429    0%   /Volumes/Clone
/dev/disk3     3.1T   3.1T    19G   100% 3498238 4291469041    0%   /Volumes/Macintosh HD
-bash-3.2#diskutil eraseVolume jhfs+ "Macintosh HD" disk3-bash-3.2# diskutil erasevolume jhfs+ "Macintosh HD" disk3
Started erase on disk3 Macintosh HD
Unmounting disk
Dissented by PID=0 (kernel)
Error: -69888: Couldn't unmount disk
-bash-3.2#diskutil umountDisk force disk3 
	