Please visit the new Mac-Forums Facebook page:
Join Us @ Mac-Forums Facebook Page



Results 1 to 7 of 7
  1. #1
    Fusion Drive - How do I add back a partition

    Member Since
    Feb 20, 2010
    Posts
    96
    Your Mac's Specs
    iMac Late-2015 27" 5K Retina (17,1 - 3.3GHz)
    Rep Power
    10
    Fusion Drive - How do I add back a partition
    I experienced a power failure when I was in Bootcamp. When I rebooted againI noticed I could not boot into Bootcamp. But I could access the Bootcamp partition in in Finder and be able to work on files.

    So when I went to Disk Utility, I noticed that it states the size of the Fusion Drive as being just bigger than macOS install and completely disregards the Bootcamp partition

    [spoiler]
    Screen Shot 2018-04-05 at 20.09.31.png
    [/spoiler]

    diskutil cs list
    Code:
    CoreStorage logical volume groups (1 found)
    |
    +-- Logical Volume Group DD388015-1FFF-4831-9CF2-9CD8367E2742
        =========================================================
        Name:         iMac
        Status:       Online
        Size:         826852675584 B (826.9 GB)
        Free Space:   749568 B (749.6 KB)
        |
        +-< Physical Volume 1CA5E61B-C026-4CF8-8AF4-B7DF7F5F22D2
        |   ----------------------------------------------------
        |   Index:    0
        |   Disk:     disk1s2
        |   Status:   Online
        |   Size:     120338849792 B (120.3 GB)
        |
        +-< Physical Volume 8E14E744-451B-416F-A1BB-381DAE3E02EA
        |   ----------------------------------------------------
        |   Index:    1
        |   Disk:     disk0s2
        |   Status:   Online
        |   Size:     706513825792 B (706.5 GB)
        |
        +-> Logical Volume Family 1D47764C-26B0-4C36-93A7-323A023C19A6
            ----------------------------------------------------------
            Encryption Type:         None
            |
            +-> Logical Volume 94350E47-4BD3-48A2-B9DC-454AACAF0083
                ---------------------------------------------------
                Disk:                  disk2
                Status:                Online
                Size (Total):          821000273920 B (821.0 GB)
                Revertible:            No
                LV Name:               Macintosh HD
                Volume Name:           Macintosh HD
                Content Hint:          Apple_HFS
                LVG Type:              Fusion, Sparse
    $ diskutil list
    Code:
    /dev/disk0 (internal, physical):
       #:                       TYPE NAME                    SIZE       IDENTIFIER
       0:      GUID_partition_scheme                        *2.0 TB     disk0
       1:                        EFI EFI                     209.7 MB   disk0s1
       2:          Apple_CoreStorage iMac                    706.5 GB   disk0s2
       3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
       4:       Microsoft Basic Data BOOTCAMP                1.3 TB     disk0s4
    
    /dev/disk1 (internal, physical):
       #:                       TYPE NAME                    SIZE       IDENTIFIER
       0:      GUID_partition_scheme                        *121.3 GB   disk1
       1:                        EFI EFI                     209.7 MB   disk1s1
       2:          Apple_CoreStorage iMac                    120.3 GB   disk1s2
       3:                 Apple_Boot Boot OS X               134.2 MB   disk1s3
       4:                  Apple_HFS Boot OS X               134.2 MB   disk1s4
       5:           Linux Filesystem boot                    73.4 MB    disk1s5
       6:           Linux Filesystem                         440.4 MB   disk1s6
    
    /dev/disk2 (internal, virtual):
       #:                       TYPE NAME                    SIZE       IDENTIFIER
       0:                  Apple_HFS Macintosh HD           +821.0 GB   disk2
                                     Logical Volume on disk1s2, disk0s2
                                     94350E47-4BD3-48A2-B9DC-454AACAF0083
                                     Unencrypted Fusion Drive
    What command do I need to issue to add the Bootcamp partition back into Fusion Drive?

  2. #2
    Fusion Drive - How do I add back a partition
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Keller, Texas
    Posts
    59,047
    Your Mac's Specs
    2017 27" iMac, 10.5" iPad Pro, iPhone 7+, iPhone 8, Numerous iPods, Mojave
    Rep Power
    53
    Let me see if I have the disks and sizes straight:

    It appears that your Fusion drive (2 TB) consists of a 120 GB SSD plus a HHD of approx 1.8 TB fused together to equal 2 TB.

    What might have happened when you experienced the power loss is that the EFI is now corrupt and no longer recognizes the Boot Camp partition. I read of another similiar thread in a different forum than ours where the OP asked Apple for help. They told him to reinstall macOS from Recovery and that would solve the problem. Sounds simple but it did work for that person. Reinstalling from Recovery will not overwrite your data nor destroy the Boot Camp Partition. However, I strongly recommend that you backup both your macOS partition and Boot Camp partition before reinstalling.

    Some advice: Buy a good UPS and use it.

  3. #3
    Fusion Drive - How do I add back a partition

    Member Since
    Feb 20, 2010
    Posts
    96
    Your Mac's Specs
    iMac Late-2015 27" 5K Retina (17,1 - 3.3GHz)
    Rep Power
    10
    thanks. let me look in that

  4. #4
    Fusion Drive - How do I add back a partition

    Member Since
    Feb 20, 2010
    Posts
    96
    Your Mac's Specs
    iMac Late-2015 27" 5K Retina (17,1 - 3.3GHz)
    Rep Power
    10
    Quote Originally Posted by chscag View Post
    Let me see if I have the disks and sizes straight:

    It appears that your Fusion drive (2 TB) consists of a 120 GB SSD plus a HHD of approx 1.8 TB fused together to equal 2 TB.

    What might have happened when you experienced the power loss is that the EFI is now corrupt and no longer recognizes the Boot Camp partition. I read of another similiar thread in a different forum than ours where the OP asked Apple for help. They told him to reinstall macOS from Recovery and that would solve the problem. Sounds simple but it did work for that person. Reinstalling from Recovery will not overwrite your data nor destroy the Boot Camp Partition. However, I strongly recommend that you backup both your macOS partition and Boot Camp partition before reinstalling.

    Some advice: Buy a good UPS and use it.
    thanks tried the reinstall from macOS Recovery but same issue persists

    I also notice that the Bootcamp partition has Type: Unknown

    The Macintosh HD partition has Type: CoreStorage Logical Volume

    So it seems to me that I need something that will make the Bootcamp partition be seen as a Logical Volume in the Fusion Drive

    If anyone is running Bootcamp, could you post your diskutil cs list and diskutil list please
    Last edited by milomak; 04-05-2018 at 05:46 PM.

  5. #5
    Fusion Drive - How do I add back a partition

    Member Since
    Feb 20, 2010
    Posts
    96
    Your Mac's Specs
    iMac Late-2015 27" 5K Retina (17,1 - 3.3GHz)
    Rep Power
    10
    This is the solution
    https://apple.stackexchange.com/ques...x-boot-entries

    Anyway,the most important thing I was able to boot my BOOTCAMP/Windows partition after it was gone/lost/disappeared from the boot options
    Last edited by milomak; 05-01-2018 at 12:40 PM.

  6. #6
    Fusion Drive - How do I add back a partition
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Keller, Texas
    Posts
    59,047
    Your Mac's Specs
    2017 27" iMac, 10.5" iPad Pro, iPhone 7+, iPhone 8, Numerous iPods, Mojave
    Rep Power
    53
    Looks like you had to do some more work. Anyway, glad you resolved it and thanks for posting the link which should help others.

  7. #7
    Fusion Drive - How do I add back a partition

    Member Since
    Feb 20, 2010
    Posts
    96
    Your Mac's Specs
    iMac Late-2015 27" 5K Retina (17,1 - 3.3GHz)
    Rep Power
    10
    It seems though diskutil (maybe by default?) doesn't pick up the BOOTCAMP partition as part of the logical drive

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Replies: 2
    Last Post: 11-26-2017, 12:08 AM
  2. Migration Assistant - Fusion Partition
    By Koyangie in forum macOS - Operating System
    Replies: 0
    Last Post: 01-08-2011, 07:16 PM
  3. VMWare Fusion Extra Partition
    By WKMENT in forum Running Windows (or anything else) on your Mac
    Replies: 3
    Last Post: 03-12-2009, 02:07 AM
  4. Add Partition
    By JamesWat in forum macOS - Operating System
    Replies: 3
    Last Post: 12-10-2007, 09:38 PM
  5. Fusion - bootable partition off of a laptop
    By temp1234 in forum Other Hardware and Peripherals
    Replies: 0
    Last Post: 09-24-2007, 12:34 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •