Can Windows XP run on a Snow Leopard Mac?

Hi,
     Let me just start by saying that I have a version of Windows XP that I have modified to be able to boot and run on a USB drive, regardless of whether or not that drive is a flash drive or a hard disk. I have installed that Windows XP on a flash drive, even fixed its master boot record and customized the boot.ini file and added the ntldr file and the ntdetect.com file and my Mac which is a Mid-2010 (MacBookPro 7,1) refuses to recognize the disk even though it is recognized and runs fine on a PC. Can anyone explain what the problem is?
Thanks, Chris

Yes, it does. However, the way OS X formats a GUID partition is much different than the way that Windows formats it. I believe what I am trying to do is possible, but it is extremely tricky.
The bottom line is that you have to plug the USB drive into a SATA/ESATA conversion connector on a PC because Windows won't let you create a Microsoft protected partition on a removable drive, so you have to trick it into thinking that it is a normal disk.
After freeing all of the space on the disk, you run diskpart as an administrator
DISKPART> list disk
DISKPART> select disk <the disk you want>
DISKPART> convert gpt
DISKPART> create efi partition size=102
DISKPART> create msr partition (create a microsoft protected partition; however, this command will fail on a removable drive)
DISKPART> create primary partition size=<the size in MB you want> ID=EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
DISKPART> list partition
DISKPART> select partition <the partition you want to format NTFS>
DISKPART> format fs=ntfs
DISKPART> active
DISKPART> assign
<create more partitions if you want; otherwise, exit DISKPART>
Next, you must turn on BootCamp because the installer needs some FAT32 or NTFS space to work with during its installation. Insert the Windows installation CD and then enter setup. Select the partition you want to install Windows to and press enter. Now, Windows should be able to start from the drive attached as a USB drive again. If it does not then you need a Windows install CD that has a repair functionality. Wait until Windows setup loads and then make sure you have the correct partition then press R to enter the repair console and it will ask you which Windows installation you want to work with. Make sure you select the correct installation number then type fixmbr and enter and type y and enter to the warning presented. Then restart the computer and you should be able to select the USB drive on either a Mac or PC. You have to use the very specific ID above because it is the only ID that Windows XP recognizes with respect to GUID partitions.

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