Je pense aussi. Voici ce que me donne diskutil list :
:~ jordan$ diskutil list
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *275.1 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage Macintosh SSD 274.2 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
/dev/disk1 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *500.1 GB disk1
1: EFI EFI 209.7 MB disk1s1
2: Apple_HFS Macintosh HD 499.2 GB disk1s2
3: Apple_Boot Recovery HD 650.0 MB disk1s3
/dev/disk2 (internal, virtual):
#: TYPE NAME SIZE IDENTIFIER
0: Macintosh SSD +273.8 GB disk2
Logical Volume on disk0s2
215D7E34-E849-42C3-A103-2B4F3981B55F
Unencrypted
/dev/disk3 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: Apple_partition_scheme +196.7 MB disk3
1: Apple_partition_map 32.3 KB disk3s1
2: Apple_HFS Firefox 196.7 MB disk3s2
/dev/disk4 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk4
1: EFI EFI 209.7 MB disk4s1
2: Apple_HFS DD LARUE 1T 999.9 GB disk4s2
:~ jordan$ diskutil list
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *275.1 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage Macintosh SSD 274.2 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
/dev/disk1 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *500.1 GB disk1
1: EFI EFI 209.7 MB disk1s1
2: Apple_HFS Macintosh HD 499.2 GB disk1s2
3: Apple_Boot Recovery HD 650.0 MB disk1s3
/dev/disk2 (internal, virtual):
#: TYPE NAME SIZE IDENTIFIER
0: Macintosh SSD +273.8 GB disk2
Logical Volume on disk0s2
215D7E34-E849-42C3-A103-2B4F3981B55F
Unencrypted
/dev/disk3 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: Apple_partition_scheme +196.7 MB disk3
1: Apple_partition_map 32.3 KB disk3s1
2: Apple_HFS Firefox 196.7 MB disk3s2
/dev/disk4 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *1.0 TB disk4
1: EFI EFI 209.7 MB disk4s1
2: Apple_HFS DD LARUE 1T 999.9 GB disk4s2