Macintosh HD Partition Split?

Hardware is new iMac 27" with Retina Display, and 3TB Fusion Drive.
Installed Windows 7 using Boot Camp Assistant. No errors were encountered during the install.
Here is the resulting Partition Map from Disk Utility:
Note that the Macintosh HD Partition is split into two sections with the Boot Camp in the middle. The sizes of the partitions in order from top to bottom are: 2.08 TB, 120 GB, 801.44 GB.
The other anomaly is that when booting with the [option] key you are presented with 4 choices. They are 3 identical Macintosh HD disks followed by 1 Windows disk. I have tried booting from all of them and they all work.
So my question is, "What's going on here?" I have a call in to Apple Support and waiting for them to get back to me. If I get an answer, I'll post it for your consideration.

Loner T wrote:
... uses a Hybrid MBR which is limited to four (4) partitions and a 2TB (2.2Tib) upper space limit. A 3TB Fusion drive is split three ways to work around this limit.
The disk can be partitioned using just GPT for W8.1 and an EFI installation can also address this three-way split.
What is a "Hybrid MBR"? Please explain "GPT" and if there is any reason to address this split. The Apple support person told me that this does not affect any performance issues with the system.
Thanks for your comments! I recall you helped me with installing Windows on my MacPro last year.

Similar Messages

  • How can I resize my Macintosh HD partition?

    Last year I had to create three partitions (120 GB for Macintosh HD, 510 GB for Data, and 120GB for Spare) on my HDD for a program I was taking. However, I'm finding that a 120 GB partition for Macintosh HD isn't sufficient for my needs anymore and would like to know if there is a way to expand the allocated size. Selecting the Macintosh HD partition and resizing the bottom-right corner will only allow me to decrease the size of the partition, not increase it. I've also tried doing this booting from a different partition and USB thumb drive.

    The reason on why this is happening is because in Disk Utility, once a partition has been created it can only be either split, or reduced in size. That's why you were able to initially split your MacBook Pro partition in three different partitions.
    Unfortunately, your only course of action is to boot inside your OS X Installer and from there re-map your hard drive. Consequently, this means that you'll have to format your hard drive and reinstall OS X and then restore your data from your hard drive back up.
    If you ever decide to go ahead and format your hard drive I strongly recommend having some form of back up for your data. Things like uploading your personal files to the cloud or USB thumb or external drive are a good start and having copies of the third-party application installers can certainly help in the proccess as well. The ideal and less complicated route is to just attach an external drive and back up all your files via Time Machine.
    I hope this information brings some clarification to your issue.
    Yum3ji wrote:
    Last year I had to create three partitions (120 GB for Macintosh HD, 510 GB for Data, and 120GB for Spare) on my HDD for a program I was taking. However, I'm finding that a 120 GB partition for Macintosh HD isn't sufficient for my needs anymore and would like to know if there is a way to expand the allocated size. Selecting the Macintosh HD partition and resizing the bottom-right corner will only allow me to decrease the size of the partition, not increase it. I've also tried doing this booting from a different partition and USB thumb drive.

  • Macintosh HD partition is not visible in Windows

    Hello
    I've a MacBook Pro mid 2012.
    A week ago I had a problem with OSX 10.9 and the Apple Premium Reseller fixed it with a clean instal of OSX. I've set everything back with my Time-machine backup. Because it was a software problem, my windows partition wasn't damaged. In Finder I can see the BootCamp-partition and of course my Macintosh HD-partition. But when boot with windows I can only see the Windows BootCamp-partition but not he Macintosh HD-partition. And that's my problem. I want to see the Macintosh HD-partition in windows. Before the clean install I could see the Macintosh HD-partition and now I want it back because I need it.
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    I also tried to give the Macintosh HD-partition a 'disc-letter' because maybe that should be the reason why I can't see the partition but I can't give the partition a letter. I did it this way: Run => type: diskmgmt.msc. But it's impossible to give it a letter. (See additional photo at the bottom) I only can delete the partition when I right-click on it. (Is it normal that my disc have so much partitions which I don't know?)
    Can someone solve my problem please?
    Thank you very much for helping me out!
    Joachim

    The number of partitions should be four (the ESP/EFI information, OSX, Recovery HD and Bootcamp) on a single disk Mac machine.
    From a working system with bootcamp, the partition id for entry 2 is AF (not AC) as is shown in your MBR, and the Windows installation only understands MBR (if you do not install using Windows 8.x/EFI on late 2013 Macs).
    sudo fdisk /dev/disk0
    Password:
    Disk: /dev/disk0 geometry: 121643/255/63 [1954210120 sectors]
    Signature: 0xAA55
             Starting       Ending
    #: id  cyl  hd sec -  cyl  hd sec [     start -       size]
    1: EE 1023 254  63 - 1023 254  63 [         1 -     409639] <Unknown ID>
    2: AF 1023 254  63 - 1023 254  63 [    409640 - 1452530904] HFS+  
    3: AB 1023 254  63 - 1023 254  63 [1452940544 -    1269536] Darwin Boot
    *4: 07 1023 254  63 - 1023 254  63 [1454211072 -  499998720] HPFS/QNX/AUX
    There is a simple fix for this. You may have to re-install Bootcamp drivers again, to allow the HFS driver to pickup the MBR entry or a reboot may be needed. Please use the following commands and stop if you see any errors. (the i386 boot error message at the start can be ignored safely). This is done by using the fdisk utility in interactive mode with the '-e' command line option.
    sudo fdisk -e /dev/disk0
    p
    setpid 2
    AF
    p
    w
    y
    Here is the help page for the fdisk utility.
    sudo fdisk -e /dev/disk0
    Password:
    fdisk: could not open MBR file /usr/standalone/i386/boot0: No such file or directory
    Enter 'help' for information
    fdisk: 1> ?
      help Command help list
      manual Show entire man page for fdisk
      reinit Re-initialize loaded MBR (to defaults)
      auto Auto-partition the disk with a partition style
      setpid Set the identifier of a given table entry
      disk Edit current drive stats
      edit Edit given table entry
      erase Erase current MBR
      flag Flag given table entry as bootable
      update Update machine code in loaded MBR
      select Select extended partition table entry MBR
      print Print loaded MBR partition table
      write Write loaded MBR to disk
      exit Exit edit of current MBR, without saving changes
      quit Quit edit of current MBR, saving current changes
      abort Abort program without saving current changes
    fdisk: 1>

  • Macintosh HD partition delete.

    Hello All,
    Simply, my problem is that I do not have a selectable hardrive to either load a back up copy of timemachine or to download a copy of Yosemite.
    To get to this sorry state I went through the following steps:
    1. My Macbook Air SSD, was completly full so I wanted to carry out a full rebuild and start from scratch.
    2. I made a full backup copy through TimeMachine and also copied my photos and other important files to an Western digital 500Gb external harddrive.
    3. Restarted the Mac using Option + R, went to diskUtility, and erased the Macintosh Harddrive, ensuring that the journaled option is chosen.
    4. Downloaded and successfully installed Maverick.Immedialty updgraded to Yosemite.
    5. Linked Itunes to my NAS drive, and then realised that I did not copy all the iTunes cover work and structure from my local drive. Decided to revert back to the original state to get what I needed.
    6. Restarted the Mac uisng Option + R and tried to use the previously saved backup from the external drive, was told that there was not enough space.
    7. This is where it all starts going wrong! Went to diskutilkity and erased the partion again and then tried to use the backup, but there is no harddrive to select.
    8. Back to diskutility, there is no partition indicated beneath the top level macintosh HD line item. In the partiton tab all the dropdowns and textboxes are grey out and can't be selected.
    9. within the avaliable drives I do have disk1 with a OS X Base System partition.
    I am unable to download or install anything and so basically stuck!
    I would appreciate any help or thoughts that you may have.
    Thanks for your help. Also let me know if I have posted in the wrong forum.
    Cheers

    You could try first to convert it to a 'normal' Mac volume by doing the following in Terminal.app
    diskutil eraseVolume JHFS+ Blank /dev/disk0s6
    Then try deleting it in the GUI normal DiskUtility program. If you still cannot delete then try also doing the following.
    First expand the Macintosh HD partition to use all the empty space. This will not destroy any data.
    Then back in Terminal.app try the following
    diskutil mergePartitions JHFS+ "Macintosh HD" disk0s3 disk0s6
    Note: Instead of disk0s3 use whatever corresponds to your existing Macintosh HD partition. Macintosh HD needs to be a Journaled HFS+ volume. You can use the following to list all the partitions.
    diskutil list
    The following is what the 'manual' for DiskUtility says
    mergePartitions [force] format name fromDevice toDevice
                    Merge two or more partitions on a disk.  All data on merged
                    partitions other than the first will be lost.  Data on the
                    first partition will be lost as well if the force argument is
                    given.
                    If force is not given, and the first partition has a resizable
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                    parameters are ignored in this case. If force is not given,
                    and the first partition is not resizable, you are prompted if
                    you want to format.  You will also be prompted to format if
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  • Can't create Macintosh HD partition - greyed out

    I was erasing the data on a mid 2012 MacBook Air before giving it away and I think I deleted the Macintosh HD partition (The second one from the top in disk utility that is indented over.)
    Once this happened I lost the OS X and was not able to get past OS X Utilities when turning it on.
    I tried doing the Reinstall OS X but my entire hard drive (128gb) was not there to select, only the recovery HD (approximately 600mb.)
    I was able to download OS X onto a flash drive and that lets me get into the MacBook, however I still cannot access the hard drive.
    When I go back into Disk Utility the option to create a partition and access the entire 120gb is greyed out.
    I don't care about saving/recovering any information, I just want it back to normal.
    If anyone can help me out it would be greatly appreciated, thank you!

    Do this:
    Install OS X Using Internet Recovery
    Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
    Boot to the Internet Recovery HD:
    Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.
    Partition and Format the hard drive:
    Select Disk Utility from the main menu and click on the Continue button.
    After DU loads select your newly installed hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
    Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed. Quit DU and return to the main menu.
    Reinstall OS X: Select Reinstall OS X and click on the Install button. Be sure to select the correct drive to use if you have more than one.
    Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
    This should restore the version of OS X originally pre-installed on the computer.

  • My Macintosh HD partition is damaged and the disk utility failed to repair it

    I cannot boot anymore after I tried to repair the disk with Disk Utility after my Mac became very slow.
    This is the second time it happened to me in a week with the same symptoms. When I try to boot, I see a gray screen and the computer just stops
    When I use the recovery partition, the disk utility fails to repair the disk, stopping after failing to fix the catalog file.
    I started to use TM to backup my data after erasing the disk and reinstalling Mountain Lion but I wonder if my hard drive is damaged because the same problem happened twice. (Thanks TM for keeping my data safe this time)
    Any advice or ways to fix that once and for all ?
    PS : The worst is that i can still boot with Bootcamp to Windows, not very useful though

    rpignard wrote:
     Any advice or ways to fix that once and for all ?
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    This can sometimes occur if the computer was moved while the hard drive was in operation, else sectors fail all by themselves, or if the drive is having mechanical issues, which you problem will continue no matter what you do.
    This time when you use Recovery > Disk Utility to erase the Macintosh HD partition, use the middle secure erase option, not the far left or right options (the right will work also just take a really long time)
    What your doing is with the middle secure erase option is called a "Zero" write, which Disk Utility will write 0's over all the bits in that partition. When it's done it will read it back for confirmation and when it does so, any bits that are failing will be mapped off by the drive. Hopefully this will resolve the issue without needing a drive replacement.
    Once that is completed, reinstall OS X from Recovery, any programs from original sources, files only from backup and your problems hopefully should disappear.
    What happens is if your data gets corrupted on the boot drive by failing sectors, it gets transfered to TimeMachine (or to bootable clones) and when you restore your right back to square one. So it's important to rule out that possibility with original installs of OS X and third party programs.
    If your problems continue, then it's possibly a problem  with third party at boot kernel extension files, (and the catalog problem was yet another one) so to solve this you need to make sure all your third party software is updated and works with your current OS X version.
    A trick is, if you get gray screen at boot time, is to hold the Shift Key while booting the computer, this will disable a lot of things and allow you to fix the third party software issue.
    What I suggest you do is have multiple backup systems, including hold option key bootable clones, this way if your TM drive gets corrupted you can go back in time to a saved state on the clone, restore that and then your files from the TM drive.
    Most commonly used backup methods

  • OS X Partition split and duplicated when creating Boot Camp partition

    Hi,
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  • Please help me install Mountain Lion from my USB on my ERASED Macintosh HD partition.

    Hi, So my Macbook 7.1 (running macosx 10.6.8) was running really slow due to poor user maintenance. I decided that i should purchase Mountain Lion and install it over the 10.6.8 version. That worked but my computer turned SUPER SLOW. So i decided to completely startover and erase the partition, and install from the USB. Unfortunately for me this is where my skillset ends, and I need help.
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    Nick

    I did the erase from Disk Utility. At the time I had started the computer by holding down Ctrl+R, so i am not sure which recovery drive it used. I can say however that I do still have the recovery partition.
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  • ORA-07445 during Partition Split in Oracle 10g

    Hi
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    calling call entry argument values in hex
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  • Problems Resizing "Macintosh HD" Partition

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  • I recently deleted a partition on my mac that was intended to install windows. Now it is just blank space. I attempt to resize my Macintosh HD partition to cover entire hard drive space and hit apply but nothing happens (disk utility). Any ideas?

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  • Blocking locks encountered while splitting partitions in 11g

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    >
    Background: I've taken over administration of a database that has several date-range partitioned tables that, suffering from a lack of proper administration, have not had their MAXVALUE partition split into the requisite monthly partitions, in almost a year. As a result, in some cases the MAXVALUE partition has 10 million rows (the monthly partitions should average 750K rows).
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    Problem: In attempting to split the MAXVALUE partition into monthly partitions while the database is on-line and accessible, I see application sessions being blocked by my split session.
    So, is my understanding above incorrect? Is there some additional syntax that I am missing? Or, are the blocking locks I'm seeing merely transient in nature, and can be ignored? The server I'm running on is not very "beefy", and the split is taking quite a while to run.
    >
    DML that modifies the table cannot be performed on the table while the split is ongoing.
    Your bigger problem is that you are using the WRONG method for your use case. If you repeatedly split the MAXVALUE partition you will be repeatedly copying and moving the same ultimate MAXVALUE data over and over again.
    DBMS_REDEFINITION is one of your options. But since I just answered this same question 3 days ago see my reply in this thread for a more thorough discussion of your options.
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  • Disk utility does not allow to restore Macintosh HD after I deleted a small size (1GB) partition

    Hi, when I tried to create a new 1GB partition (on my Mac mini 2011, using Mac OS X 10.7.3) and then to delete it I could not restore (increase) Macintosh HD size using Disk utility (diskutil list shows the same value for Macitosh HD (498,17GB) partition before and after I deleted a new created 1GB partition).
    Please help, how I can restore the original size of Macintosh HD when Disk utility does not allow to restore Macintosh HD after I deleted a small size (1GB) partition?
    Thank you.

    The bottom right corner dragging does not help in my case, because it shows that Macintosh HD partition size is maximal, but its real size did not change after I removed 1GB partition.
    Maybe any other idea can help me, for example some built-in tool like diskutil which allows to view and manage unused partitions in terminal?
    Thank you.

  • Made a new partition on Macintosh HD, Boot Camp will no longer boot.

    Specs:
    MacBook Air 2013
    8GB RAM
    i7
    512GB SSD
    Hello all, looking for some assistance.
    My HD is formatted to 400GB of OSX and 80GB of Boot Camp. I stupidly made the mistake of adding a new partition out of the large amount of free space I have on the OSX partition, to format the new partition for Windows. This made Boot Camp no longer boot. On the Disk select screen after holding Option on boot, my Boot Camp partition is not visible. I can see everything on the partition on OSX, however.
    To try and fix this, I deleted the new partition and tried to reduce the hard drive back to the original two partitions. However, I cannot extend the OSX partition to fill in the new free space. So now I have a Boot Camp partition, my OSX partition, and 20GB of unused, free space that I cannot use or put back into the original partition.
    I asked AppleCare live chat for any assistance, they suggested that I use "Erase free space" in Disk Utility to use the space again. However, the option is greyed out on both the drive and the Macintosh HD partition.
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    "rEFIt is an alternative bootloader for your Mac that's a lot more forgiving. If you don't think investing in iPartition is worth it, I'd give this a shot:
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  • Once you delete a second partition on your hard drive and there is only blank space how do you enlarge the original "Macintosh HD" to cover the entire hard drive space?

    I just delete a partition on my drive and wanted to 1 either enlarge my original partition to cover the entire space, or 2 create a new partition in the free space. The problem is when I attempt to drag down the Macintosh HD partition and hit apply nothing happens. When i try to partition the free space (80 gigs) I hit apply and the new partition is only 200 mb with the 79 gigs still free space... HELP PLEASE.

    Ah...so you've now learned why it's best not to change your mind after partitioning the bootup volume. 
    As far as I know, there's no "built-in" way to recover the free space after deleting a partition.
    You're probably looking at third party software to accomplish what you're looking for.  Here's one:
    http://www.drivetoolbox.com/volume-manager.php
    I can't speak to how well it works....I've never used it.  But, according to the site, it will do what you need it to do.
    I hope this helps.

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