-bash-3.2# diskutil resizeVolume disk2s4 395g jhfs+ BOOT 0b
Resizing to 395000000000 bytes and adding 1 partition
Started partitioning on disk2s4 Clone
Verifying the disk
Verifying file system
Checking Journaled HFS Plus volume
Checking extents overflow file
Checking catalog file
Checking multi-linked files
Checking catalog hierarchy
Checking extended attributes file
Checking volume bitmap
Checking volume information
The volume Clone appears to be OK
File system check exit code is 0
Resizing
Shrinking file system
Modifying partition map
Initialized /dev/rdisk2s5 as a 4 GB case-insensitive HFS Plus volume with a 8192k journal
Mounting disk
Finished partitioning on disk2s4 Clone
/dev/disk2 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *2.0 TB     disk2
   1:                        EFI EFI                     209.7 MB   disk2s1
   2:          Apple_CoreStorage Sans titre              1.6 TB     disk2s2
   3:                 Apple_Boot Boot OS X               134.2 MB   disk2s3
   4:                  Apple_HFS Clone                   395.0 GB   disk2s4
   5:                  Apple_HFS BOOT                    4.6 GB     disk2s5
-bash-3.2#