-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#