- May 3, 2012
- Intel DH67BL
- Core i7-2600K
- Intel HD 3000
- Mobile Phone
It is definitely something that it doesn't like about the EFI partition. I was able to partition in Windows but had to use diskpart at the command line before running the Windows installer.4k doesn't seem to be relevant - tried with an older drive using the Windows tool to format and chose default. Results are the same.
I think I found the problem, though. While in disk utility I tried selecting the drive and using the repair tool. In the detail page it said the EFI partition was too small and it could not be changed. OK, so went and formatted the drive with OS X disk utility, 1 partition and looked at the drive with diskutil list. EFI partition for OS X is 209.7Mb. Windows is 100Mb View attachment 95326 . So, experimenting a bit, I formatted the drive 1 partition. Rebooted with the Win7 install media and this time did not delete the EFI partition created by OS X disk utility. Chose to let Win7 create its partitions default single partition for the drive and Win7 was happy with it and installed with no problem.
Used Win7 disk management tool to shrink the single partition, created a Simple Volume and formatted it NTFS, default and rebooted to UniBeast. OS X installed without a single problem after erasing the partition using OS X Extended (Journaled) format.
Conclusion? Is it just the EFI partition size OS X doesn't like with older versions of Windows installed UEFI?
The process went like this:
- boot Windows installer USB
- at first screen press Shift+F10 to get command prompt
- type: diskpart
- type: list disk (to you're certain on the disk you're working with, in my case confirms disk 0)
- type: select disk 0
- type: clean (don't blame me if you don't know what this does
- type: convert gpt
- type: create partition efi size=200
- type: format quick fs=fat32 label="EFI"
- type: create partition msr size=128
- type: exit
- type: exit
Now you can continue with the Windows Installer, and install to unallocated space (via Custom).
If you go into Disk Utility after installing Windows with this setup, you'll find it likes the EFI setup.
Obviously, the above doesn't help someone with a similar setup from an OEM, but it does allow a fresh install of Windows UEFI first.
Next up: Determine if there is a way to fix the broken situation after a default fresh install... Stay tuned...