Conosco lo scopo delle partizioni "EFI", "Boot OS X" e "Recovery HD". Ma perché ci sono tre diverse partizioni "Macintosh HD"? E dovrebbero esserci due partizioni EFI?
UPDATE
Ecco cosa disktutil list
riporta
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *121.3 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage 121.0 GB disk0s2
3: Apple_Boot Boot OS X 134.2 MB disk0s3
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *3.0 TB disk1
1: EFI EFI 209.7 MB disk1s1
2: Apple_CoreStorage 2.7 TB disk1s2
3: Apple_Boot Recovery HD 650.1 MB disk1s3
4: Apple_HFS Data 326.8 GB disk1s4
/dev/disk2
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Macintosh HD *2.8 TB disk2
Logical Volume on disk0s2, disk1s2
03BC8817-F05E-4FC3-9A5C-50130CDAB3AB
Unencrypted Fusion Drive