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edited Jun 7, 2015 at 17:15

UPDATE

Here is what disktutil list reports

/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

UPDATE

Here is what disktutil list reports

/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

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asked Jun 7, 2015 at 16:52

RHPT

What are all these partitions on my Mac?

I know the purpose of "EFI", "Boot OS X", and "Recovery HD" partitions. But why are there three different "Macintosh HD" partitions? And should there be two EFI partitions?

enter image description here

macos partition