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  1. #1


    Member Since
    Feb 20, 2010
    Posts
    94
    How many EFI partitions with Bootcamp?
    There was a power failure while I was in Bootcamp.

    What followed after that was that if I pressed the alt key, the Bootcamp drive was no longer visible.

    In trying to bring it back from the dead, I noticed that there were 2 EFI partitions that I could see (the drive is still there and intact with its information)

    as can be seen both disk0 amd disk1 have EFI type partitions.

    Code:
    $ 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 iMac                    120.3 GB   disk0s2
       3:                 Apple_Boot Boot OS X               134.2 MB   disk0s3
       4:                  Apple_HFS Boot OS X               134.2 MB   disk0s4
       5:           Linux Filesystem boot                    73.4 MB    disk0s5
       6:           Linux Filesystem                         440.4 MB   disk0s6
    
    /dev/disk1 (internal, physical):
       #:                       TYPE NAME                    SIZE       IDENTIFIER
       0:      GUID_partition_scheme                        *2.0 TB     disk1
       1:                        EFI EFI                     209.7 MB   disk1s1
       2:          Apple_CoreStorage iMac                    732.5 GB   disk1s2
       3:                 Apple_Boot Recovery HD             650.0 MB   disk1s3
       4:       Microsoft Basic Data BOOTCAMP                1.3 TB     disk1s4
    
    /dev/disk2 (internal, virtual):
       #:                       TYPE NAME                    SIZE       IDENTIFIER
       0:                  Apple_HFS Macintosh HD           +847.0 GB   disk2
                                     Logical Volume on disk0s2, disk1s2
                                     94350E47-4BD3-48A2-B9DC-454AACAF0083
                                     Unencrypted Fusion Drive

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Keller, Texas
    Posts
    55,447
    Specs:
    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
    Welcome to our forums.

    You're showing a Linux partition (obviously you installed Linux on that drive), in addition to macOS and Windows Boot Camp. The power failure may have killed the boot sector for Windows. Are you able to boot to Linux? Since the drive is actually two drives (121.3 GB SSD and 2.0 TB Hard Drive) fused together (Fusion Drive) there are going to be two EFI partitions.

    I would guess off hand that you're going to wind up wiping that drive and reinstalling Boot Camp and Windows. Possible also Linux. Advice we can give you is to avoid installing Windows or Linux on a Fusion Drive. Using Virtual Software would be much better. But that's up to you.

  3. #3


    Member Since
    Dec 11, 2010
    Location
    Chicago
    Posts
    1,739
    Specs:
    late 2012 mini w/SSD

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