December 1, 2007
Multibooting Windows/OSX on guid.
Long waited solution 
To make it , need to use gptsync, i found binary for linux (from apt-get isntall refit)
Good luck with finding out binary for osx.
Ok, so, u need to sync your gpt table to mbr table, the only limitation - mbr can have only 4 entry for partitions,
and first entry will be used for guid protective entry (partition with type 0xEE)
So, u will have three partitions to install windows.
However installing windows will overwrite mbr boot sector (where u installed boot0),
so need to reinstall boot0 after it
So, u can have up to 128 guid partitions, but only first three (excluding efi partition)
will be windows-compatible
If windows knows about gpt (not xp, 2003sp1 knows guid e.g., or 64-bit xp, or vista),
then u can use other gpt partitions
for data, u still can’t boot windows of it(diskXs2-4 – bootable for windows, diskXs5+ – not bootable).
pc_efi is able to boot windows bootloader from partition (chainloading).
Good luck.
Users posted gptsync for OSX in comments.
P.S. binary gptsync for linux I found - gptsync
P.P.S OSX will see drive ad guid still, after any changes to guid partition table, u need to resync it again.
Comments(15)
A lot of piggybacking between gpt/mbr. but its cool.
Can you resize GPT’ed NTFS/FAT partition with disk utility etc? Also Disk Utility doesn’t support Moving partitions once resized.
Next is RAID booting on GPT??
netkas
u know this error?
using efi 7.1
greetz =)
link: http://img211.imageshack.us/my.php?image=0112070551fg3.jpg
I do like this, but I am wondering if this should be a separate project. IE: PC_EFI that strives to be IDENTICAL to the actual Mac hardware, and one with chainloading, etc. Personally, I would love to see PC_EFI that will allow hardware profiles to be added so there doesn’t have to be any kext modification, IE: the x1600 v6 EFI.
Dear netkas! What about 200M EFI partition – now it’s only useless waste of a disk space…
Have you any plans for it in future?
Проще говоря, не предполагается ли вынести часть EFI модулей туда, чтобы они занимались своим делом, а не лежали в папке Extentions?..
No way to enable BOOT CAMP by PC_EFI? That’s what make you approaching MAC, I guess.
f41qu3 :
That error occurs on my machine every so often, but goes away after a restart. It has to do with the EFI loader properly detecting the system clock, but I don’t know what the fix is if it’s happening all the time.
i dont really understand what we need??
So we have to install refit?
Sync it
install windows
redo boot0 and we are good?
I’ve compiled an os x binary of gptsync from the refit project. Seemed to work from the Leopard install DVD (can’t sync the partition map on the drive you’re booted from).
Currently testing/installing, seems to have worked.
RS Link: http://rapidshare.com/files/73933573/gptsync_tools.zip.html
gptsync and showpart in there. should at least work on leopard, unsure about earlier.
i didnt need to use gptsync. vista works fine now
how ?
Just as an FYI using gptsync from the leopard install disk (the one I’ve posted) has worked for me, and I’ve got dual-booting WinXP 32 & Mac OS X.
Is there any way to have the list of volumes show up for a brief time before booting without having to mash the F8 button? Would also be nice to be able to decide under OS X or other operating systems which OS to boot next.
That said, I’m not complaining. What you’ve done netkas is quite awesome.
Re netkas on i am…me: I think he’s using 64-bit versions of Windows, or other ones that are GPT aware. There’s a thread on forum.insanelymac where he describes what he’s using.
gptsync cant detect GUID and MBR partition tables even when booting off a DVD. Is it because the harddrive is a SATA?
Hi gents,
I ‘v got succes by tripplebooting OS: Leopard, windows XP, Linux.
I will share my “how to” as soon as it will be ready,
see you mate
can i setup a dual boot using ubuntu instead windoze using this solution?
Hi. Netkas. Pystar has setteled with Apple, you must at least try to settle with both Apple and/or Pystar. I think they’ll be making a software product out of this mess, look at their codes that’ll surely defeat the hackintosh for good or for a long time.