diskutil list
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *121.3 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage Macintosh HD 121.0 GB disk0s2
3: Apple_Boot Boot OS X 134.2 MB disk0s3
/dev/disk1 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *3.0 TB disk1
1: EFI EFI 209.7 MB disk1s1
2: Apple_CoreStorage Macintosh HD 2.2 TB disk1s2
3: Apple_Boot Recovery HD 650.0 MB disk1s3
4: Apple_CoreStorage Macintosh HD 801.4 GB disk1s4
5: Apple_Boot Boot OS X 134.2 MB disk1s5
/dev/disk2 (internal, virtual):
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Macintosh HD +2.0 TB disk2
Logical Volume on disk0s2, disk1s2, ...
BE4DFD83-22C9-4585-966B-DDE58AB468A3
Unencrypted Fusion Drive
/dev/disk3 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *80.0 GB disk3
1: EFI EFI 209.7 MB disk3s1
2: Apple_HFS CLE 79.7 GB disk3s2
/dev/disk4 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *8.1 GB disk4
1: EFI EFI 209.7 MB disk4s1
2: Apple_HFS CLE 7.7 GB disk4s2