linsolentdu75:~ mac$ diskutil resizeVolume disk2s3 90g jhfs+ CLE 0b ; diskutil list
Resizing to 90000000000 bytes and adding 1 partition
Started partitioning on disk2s3 EL CAPITAN
Verifying the disk
Verifying file system
Volume was successfully unmounted
Performing fsck_hfs -fn -x /dev/rdisk2s3
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 EL CAPITAN appears to be OK
File system check exit code is 0
Restoring the original state found as mounted
Resizing
Shrinking file system
Modifying partition map
Initialized /dev/rdisk2s4 as a 9 GB case-insensitive HFS Plus volume with a 8192k journal
Mounting disk
Finished partitioning on disk2s3 EL CAPITAN
/dev/disk2 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *500.1 GB disk2
1: EFI EFI 209.7 MB disk2s1
2: Microsoft Basic Data TITOU 399.6 GB disk2s2
3: Apple_HFS EL CAPITAN 90.0 GB disk2s3
4: Apple_HFS CLE 9.7 GB disk2s4
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *251.0 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_APFS Container disk1 150.0 GB disk0s2
3: Microsoft Basic Data BOOTCAMP 100.3 GB disk0s3
4: Windows Recovery 508.6 MB disk0s4
/dev/disk1 (synthesized):
#: TYPE NAME SIZE IDENTIFIER
0: APFS Container Scheme - +150.0 GB disk1
Physical Store disk0s2
1: APFS Volume Macintosh HD - Données 117.6 GB disk1s1
2: APFS Volume Preboot 80.5 MB disk1s2
3: APFS Volume Recovery 528.1 MB disk1s3
4: APFS Volume VM 1.1 GB disk1s4
5: APFS Volume Macintosh HD 11.0 GB disk1s5
/dev/disk2 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *500.1 GB disk2
1: EFI EFI 209.7 MB disk2s1
2: Microsoft Basic Data TITOU 399.6 GB disk2s2
3: Apple_HFS EL CAPITAN 90.0 GB disk2s3
4: Apple_HFS CLE 9.7 GB disk2s4