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Windows detects GPT disk as MBR in EFI boot

24 Feb

This disk is OCZ VERTEX 128GB SSD. It is formatted as GPT from OSX. The disk layout is,

/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *128.0 GB   disk1
   1:                        EFI                         209.7 MB   disk1s1
   2:                 Apple_RAID                         63.8 GB    disk1s2
   3:                 Apple_Boot Boot OS X               134.2 MB   disk1s3
   4:       Microsoft Basic Data ssdwin                  63.9 GB    disk1s4

I’m trying to install windows7 in the “ssdwin” partition but when i EFI Boot windows 7 64bit USB installer, it says,

Windows cannot be installed to this disk. The selected disk has a mbr partition table, On EFI system window can only be installed to GPT disks.

Did you happen to use Apple’s Disk Utility to create a FAT filesystem in that to-be-Windows partition? If so, you converted the disk from a legal GPT disk into a hybrid MBR disk, which OS X sees as GPT and Windows sees as MBR. The solution in this case is to clear the hybrid MBR data. A number of utilities can do this. I’ll describe how to do it with my own GPT fdisk (gdisk) utility:

  1. Download GPT fdisk from its Sourceforge page and install it. (Versions are available for Linux, OS X, and Windows. I’ll assume you’ll do this from OS X.) Alternatively, you could run it from a Linux emergency disc like Parted Magic.
  2. Launch gdisk on your disk by typing sudo gdisk /dev/disk1 in a Terminal window. (Change the device identifier if it’s not as you presented earlier or if you use another OS for the job.)
  3. Type p to view the partition table to verify you’re working on the correct disk. If not, type q to quit without saving your changes and try again with another device.
  4. Type x to enter the experts’ menu.
  5. Type n to create a fresh protective MBR. Note that gdisk won’t confirm a change; it’ll just show you a new experts’ prompt.
  6. Type w to save your changes. You’ll be asked to confirm this action. Do so.

With any luck this will fix the problem. If it doesn’t, though, you can use gdisk‘s v option (on any menu) to have gdisk look for partition table problems. It can fix some minor problems automatically, but other times you’ll need to make explicit changes. See the GPT fdisk documentation on GPT repairs for details.

http://superuser.com/questions/508026/windows-detects-gpt-disk-as-mbr-in-efi-boot

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2 Comments

Posted by on February 24, 2013 in Mac

 

2 responses to “Windows detects GPT disk as MBR in EFI boot

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