Previous 1 2 3 Next 32 Replies Latest reply: Jan 28, 2014 6:40 AM by rafmudaf
Talabard Level 1 (0 points)


I just received a new 27 inch iMac as a replacement for my old machine, which apparently disntegrated during warranty. In setting it up, I tried to create a small partition on the hard drive to run a Linux distro for testing purposes. It seems that with the non-system disc versions of the OS this has become more complex, and what I recall as an easy process turned into a disaster where 2 of the 3 TBs on the machine are locked out as "free space". I humbly retreat from any thoughts of working with partitions on this machine - I just want to clean it up and get it to a one-partition state for music and graphic design production. I have a backup. Here is a snapshot of this nightmare:

Screen Shot 2013-01-30 at 7.51.13 PM.jpg

I also note that at the top level, where I am used to seeing "Hitachi" (or whomever makes the hard drive) it says Macintosh HD. That can't be right?


Here is a diskutil list report:



   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *3.0 TB     disk0

   1:                        EFI                         209.7 MB   disk0s1

   2:          Apple_CoreStorage                         1.3 TB     disk0s2

   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3


   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:                  Apple_HFS Hard Drive             *1.3 TB     disk1


I want to get rid of disk1, I guess, and make disk0 correspond to the 3.0 TB physical volume, not a "Logical Volume Family".


  Name:         Macintosh HD

    Size:         1255995588608 B (1.3 TB)

    Free Space:   0 B (0 B)


    +-< Physical Volume 27B24C33-92E7-4DC1-99B0-165BF47601AE

    |   ----------------------------------------------------

    |   Index:    0

    |   Disk:     disk0s2

    |   Status:   Online

    |   Size:     1255995588608 B (1.3 TB)


    +-> Logical Volume Family 4FDA0589-59C5-4C94-AFC1-F7E82B21A450


        Encryption Status:       Unlocked

        Encryption Type:         None

        Conversion Status:       NoConversion

        Conversion Direction:    -none-

        Has Encrypted Extents:   No

        Fully Secure:            No

        Passphrase Required:     No


        +-> Logical Volume 74E89BB3-AEBF-477C-B7B0-47EE71BC5BB0


            Disk:               disk1

            Status:             Online

            Size (Total):       1255676813312 B (1.3 TB)

            Size (Converted):   -none-

            Revertible:         No

            LV Name:            Hard Drive

            Volume Name:        Hard Drive

            Content Hint:       Apple_HFS



Any thoughts? restarting to Command-R seems like it would not address the partition problem at all. I suppose I could put it in target mode and use my laptop to wipe it, but I'm not sure that would address the partitions either. I am completely comfortable with removing the built-in system recovery area if necessary, as I made a system mount on a USB stick.

  • Frank Caggiano Level 7 (25,722 points)

    Does the system have a fusion drive?


    Go to About This Mac->More Info->Storage to see if there is a fusion drive

  • Talabard Level 1 (0 points)

    Hi Frank, no it does not.

  • Eric Root Level 9 (50,448 points)

    If you booted into Recovery Drive, you could solve the partition issue using Disk Utility.

  • Talabard Level 1 (0 points)

    When I boot into recovery drive, it gives me the option of reinstalling inside the 1.3 TB "Macintosh HD", which makes me think the partition will remain. I want to see 3.0 TB. I can try and take some screen shots when I get home this evening.

  • Talabard Level 1 (0 points)

    The specs of the replacement unit are: 27-inch iMac Z0MS 3.4GHz Quad-core Intel Core i7, Turbo Boost up to 3.9GHz, 8GB 1600MHz DDR3 SDRAM - 2x4GB, 3TB Serial ATA Drive @ 7200 rpm, NVIDIA GeForce GTX 680MX 2GB GDDR5.

  • Csound1 Level 8 (46,972 points)

    Boot to recovery. From recovery start Disk Utility and re-partition the drive to 1 partition, choose Mac OSX, Extended (Journaled) as the format and name the drive. (this will erase everything on the drive so clone the partition before you start). When that is done restore the clone to the new partition.


    Disconnect any external drives while you do this.

  • Frank Caggiano Level 7 (25,722 points)

    I asked about the fusion drive because I was surprised to see that the  Logical Volume family was showing in your display. I thought that would have only been used on systems with a ssd and HD to make the fusion drive.


    Unfortunately I have not been able to get my hands on a new iMac so I'm not sure what the partitioning of the drive should look like but what you have doesn't seem right.

  • Talabard Level 1 (0 points)

    I will take another look at his option when I get home this evening, I may have some screen shots because this was the option that suggested itself immediately but I didn't see what I expected when I went to disk utility. Also, I am not at all averse to just wiping it all out and reinstalling a backup - in that situation is cloning necessary? Will reinstalling a backup reinstall the partitions?

  • Csound1 Level 8 (46,972 points)

    I always prefer cloning (especially for this purpose) you can boot to the clone and check that all is OK before committing to it, but if you have a backup (Time Machine?) and you are 100% sure that it will restore to what you want, then use it, but I wouldn't.

  • Frank Caggiano Level 7 (25,722 points)

    So the fact that a  non-Fusion drive 2012 iMac has the Logical Volume family set is ok?


    Is this how the new mac's will look by default with or without a fusion drive?

  • Csound1 Level 8 (46,972 points)

    Frank Caggiano wrote:


    So the fact that a  non-Fusion drive 2012 iMac has the Logical Volume family set is ok?


    Is this how the new mac's will look by default with or without a fusion drive?

    I don't know, but I do know that it boots now, and a clone will preserve that while the rest can be fixed.

  • Eric Root Level 9 (50,448 points)

    Two cloning programs:




    Carbon Copy Cloner

  • Talabard Level 1 (0 points)

    I restarted in recovery mode. Disk Utility looked exactly like it does in regular mode, minus the debug menu. There was no way to get to the actual 3 TB hard drive, and no way to make the partition larger. I could have divided the 1.26 TB into smaller partitions, but no relief. I'm guessing there must be a command line way to get at this problem.

  • Lanny Level 5 (6,944 points)

    Just going by your posted graphic:


    You need to mount the partition named "Macintosh HD." Right click it and mount it. Then erase it, highlight it and press the "minus" sign. You then should be able to drag the right bottom corner of the "Hard Drive" partition down through the space formerly occupied by the "Macintosh HD" partition. Then press the Apply button.

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