Multiple System Startup Disks

Question

I have some very peculiar behavior on my December 2012 27" iMac (3TB Fusion drive). After restoring from a time machine backup twice, I now see three different startup options when I hold down the OPTION key:Macintosh HDMacintosh HD 2Macintosh HD 3I have tried repairing the volume in single user mode, using fsck -fy.I have tried resetting the NVRAM.I have tried resetting the SMC.All to no avail. Startup disks in the system preference show only the Macintosh HD. I have no other symbolic links or aliases anywhere for the other two Macintosh HDs. A directory listing in terminal (ls -la) shows only Macintosh HD.Even more tricky, when I boot from the other two (yes, they boot too), it boots into my expected system volume, so they are clearly aliases to the same disk.Any ideas on this one?

Linc Davis · Answer

Triple-click anywhere in the line below to select it:{ diskutil list; echo; diskutil cs list; } | open -f -a TextEdit   Copy the selected text to the Clipboard (command-C).Launch the Terminal application in any of the following ways:☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens. ☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.Paste into the Terminal window (command-V).   A TextEdit window will open with the output of the command. Post the contents of that window, if any — the text, please, not a screenshot. The title of the window doesn&#x27;t matter, and you don&#x27;t need to post that.

bigpal · Answer

/dev/disk0   #:                       TYPE NAME                    SIZE       IDENTIFIER   0:      GUID_partition_scheme                        *121.3 GB   disk0   1:                        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                         209.7 MB   disk1s1   2:          Apple_CoreStorage                         1.9 TB     disk1s2   3:                 Apple_Boot Boot OS X               134.2 MB   disk1s3   4:       Microsoft Basic Data Windows                 320.0 GB   disk1s4   5:          Apple_CoreStorage                         801.4 GB   disk1s5   6:                 Apple_Boot Boot OS X               134.2 MB   disk1s6/dev/disk2   #:                       TYPE NAME                    SIZE       IDENTIFIER   0:                  Apple_HFS Macintosh HD           *2.8 TB     disk2CoreStorage logical volume groups (1 found)|+-- Logical Volume Group C40B2BC8-871E-44E1-AC33-B751D2709599    &#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;&#x3D;    Name:         Internal Drive    Status:       Online    Size:         2801103642624 B (2.8 TB)    Free Space:   94208 B (94.2 KB)    |    +-&lt; Physical Volume CE7292CA-60D0-4A4B-A8DE-8FA8C367FB41    |   ----------------------------------------------------    |   Index:    0    |   Disk:     disk0s2    |   Status:   Online    |   Size:     120988852224 B (121.0 GB)    |    +-&lt; Physical Volume C87928F4-3807-411A-AA56-9A21765E25FE    |   ----------------------------------------------------    |   Index:    1    |   Disk:     disk1s2    |   Status:   Online    |   Size:     1878678249472 B (1.9 TB)    |    +-&lt; Physical Volume 504D9A66-FB3B-4F51-89EC-688E6063DC38    |   ----------------------------------------------------    |   Index:    2    |   Disk:     disk1s5    |   Status:   Online    |   Size:     801436540928 B (801.4 GB)    |    +-&gt; Logical Volume Family 5C0C51D0-3E9A-4C0C-9ABD-0A601BC9CE6B        ----------------------------------------------------------        Encryption Status:       Unlocked        Encryption Type:         None        Conversion Status:       NoConversion        Conversion Direction:    -none-        Has Encrypted Extents:   No        Fully Secure:            No        Passphrase Required:     No        |        +-&gt; Logical Volume 71631608-296E-463C-A8A3-5C821CC79C25            ---------------------------------------------------            Disk:               disk2            Status:             Online            Size (Total):       2786285682688 B (2.8 TB)            Size (Converted):   -none-            Revertible:         No            LV Name:            Macintosh HD            Volume Name:        Macintosh HD            Content Hint:       Apple_HFS

bigpal · Answer

Also, this is a bootcamp drive. I used the latest BootCamp Assistant to partition the Fusion drive.

Linc Davis · Answer

That output looks OK. It&#x27;s normal to see the Core Storage (Fusion Drive) volume and each of the two physical volumes that host it in Startup Manager.