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][1]


  [1]: https://i.sstatic.net/0Mpyb.png


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