Extra Macintosh drive listed in Disk Utility?

Discussion in 'OS X Yosemite (10.10)' started by xgman, Oct 31, 2014.

  1. xgman macrumors 601

    xgman

    Joined:
    Aug 6, 2007
    #1
    Up until Yosemite, I never had this as seen in the attached pic. It is an extra greyed out Macintosh Drive listed (before the Recovery Partition) entry which shows the full disk size, same as the regular macintosh listing, but nothing more. There doesn't seem to be any extra partition there. Does anyone know what is going on there? Any way to get rid of it without reformat? I can run a repair disk on it but it shows up no where else on my imac.Thanks.
     

    Attached Files:

  2. brentmore macrumors 6502

    brentmore

    Joined:
    Jul 19, 2002
    Location:
    New York
    #2
    Maybe you're seeing a ghost...

    *ducks*

    Happy Halloween
     
  3. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #3
    Run these two commands in Terminal and after each one paste the output up here so we can see what is going on.

    Code:
    diskutil list
    Code:
    diskutil cs list
     
  4. xgman thread starter macrumors 601

    xgman

    Joined:
    Aug 6, 2007
    #4
    I'll do that this evening when I'm back at my imac.
     
  5. xgman thread starter macrumors 601

    xgman

    Joined:
    Aug 6, 2007
    #5
    If I uncheck "show every partition" in disk util debug, then I just see one instance of Macintosh HD. But here is the Terminal report requested:

    list:
    /dev/disk0
    #: TYPE NAME SIZE IDENTIFIER
    0: GUID_partition_scheme *1.0 TB disk0
    1: EFI EFI 209.7 MB disk0s1
    2: Apple_CoreStorage 999.7 GB disk0s2
    3: Apple_Boot Recovery HD 650.0 MB disk0s3
    /dev/disk1
    #: TYPE NAME SIZE IDENTIFIER
    0: GUID_partition_scheme *1.0 TB disk1
    1: EFI EFI 209.7 MB disk1s1
    2: Apple_HFS Time Machine 999.9 GB disk1s2
    /dev/disk2
    #: TYPE NAME SIZE IDENTIFIER
    0: GUID_partition_scheme *1.0 TB disk2
    1: EFI EFI 209.7 MB disk2s1
    2: Apple_HFS Mac4 999.9 GB disk2s2
    /dev/disk3
    #: TYPE NAME SIZE IDENTIFIER
    0: Apple_HFS Macintosh HD *999.4 GB disk3
    Logical Volume on disk0s2
    CEA99343-A7E6-4968-BA24-EA59832F3663
    Unencrypted
    /dev/disk4
    #: TYPE NAME SIZE IDENTIFIER
    0: GUID_partition_scheme *5.0 TB disk4
    1: EFI EFI 209.7 MB disk4s1
    2: Apple_HFS Mac2 1.0 TB disk4s2
    3: Apple_HFS Mac3 2.0 TB disk4s3
    4: Apple_HFS Storage 2.0 TB disk4s4
    /dev/disk5
    #: TYPE NAME SIZE IDENTIFIER
    0: FDisk_partition_scheme *128.0 GB disk5
    1: Windows_NTFS Flash 128.0 GB disk5s1

    cs list:


    CoreStorage logical volume groups (1 found)
    |
    +-- Logical Volume Group 9B7FF85C-DCF1-4318-8ADC-0E687683E625
    =========================================================
    Name: Macintosh HD
    Status: Online
    Size: 999695822848 B (999.7 GB)
    Free Space: 8626176 B (8.6 MB)
    |
    +-< Physical Volume 32D9ADCE-7493-4E1C-B038-6A9582642E04
    | ----------------------------------------------------
    | Index: 0
    | Disk: disk0s2
    | Status: Online
    | Size: 999695822848 B (999.7 GB)
    |
    +-> Logical Volume Family 58EC368A-56E5-487C-9AAC-1D7CFC5BB43E
    ----------------------------------------------------------
    Encryption Status: Unlocked
    Encryption Type: None
    Conversion Status: NoConversion
    Conversion Direction: -none-
    Has Encrypted Extents: No
    Fully Secure: No
    Passphrase Required: No
    |
    +-> Logical Volume CEA99343-A7E6-4968-BA24-EA59832F3663
    ---------------------------------------------------
    Disk: disk3
    Status: Online
    Size (Total): 999351648256 B (999.4 GB)
    Conversion Progress: -none-
    Revertible: No
    LV Name: Macintosh HD
    Volume Name: Macintosh HD
    Content Hint: Apple_HFS
     
  6. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #6
    You are fine and this is totally normal. What you did at some point was enable Disk Utility's debug mode and like you discovered, when you check that "show every partition" it show the logical volume group, the logical volume name and the actual volume name, so you end up with three showing. The EFI and recovery are of course supposed to be there also.
     
  7. xgman thread starter macrumors 601

    xgman

    Joined:
    Aug 6, 2007
    #7
    I get that, but it was also enabled in mavericks and only showed EFI and the Recovery Partition, not 2 Macintosh HD entries, so I thought maybe something was off. thanks for the help.
     
  8. Weaselboy Moderator

    Weaselboy

    Staff Member

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    Jan 23, 2005
    Location:
    California
    #8

    What changed is Yosemite turns the install partition into a core storage volume and makes it look like that. If you look down at the bottom of that CS list command you'll see the two Macintosh HD entries I'm talking about.
     
  9. xgman thread starter macrumors 601

    xgman

    Joined:
    Aug 6, 2007
  10. grahamperrin macrumors 601

    grahamperrin

    Joined:
    Jun 8, 2007
    #10
    For clarity, I added white spaces (hopefully without error) and used the # button whilst editing here to format as code:



    From the opening post:

    [​IMG]

    Weaselboy, please: ignoring, for a moment, the LVG (ignoring the first of the three appearances of the name 'Macintosh HD'): when Disk Utility in OS X 10.10 with Core Storage shows all partitions, can it list a single LV twice?

    xgman: please select the third of the three listings for 'Macintosh HD', copy the information offered by the utility, paste it to this topic.

    Hint: whilst the item is selected, click the blue i button to get the required information in text form.

    Thank you both.

    Background

    I'm familiar with the Debug menu of Disk Utility in releases less than OS X 10.10, and I knew that Disk Utility could not show all disks where Core Storage was used … and so on, but the screenshot above is additionally puzzling.

    It's a while since I paid attention to this:

    What techniques for disk, volume and file system management are possible with OS X, but troublesome within Disk Utility?
     
  11. Weaselboy, Nov 1, 2014
    Last edited: Nov 1, 2014

    Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #11
    It is showing the logical volume group, the logical volume, and the volume name. Before posting earlier I turned on debug mode and verified my Yosemite system shows the same layout in Disk Util. Having core storage or FileVault on will cause this.
     
  12. grahamperrin macrumors 601

    grahamperrin

    Joined:
    Jun 8, 2007
    #12
    Disk Utility in Yosemite: a name misrepresented as a partition?

    Oh, my giddy aunt. What a weird way for Apple to visualise a part of a storage system. :eek:

    I guess that Apple had to find some way to show some of what's going on, in an outdated interface that's no longer capable of showing things logically. Not for the first time, the word 'crowbar' comes to mind.

    Thanks!
     

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