Dualboot Original Xp And Osx

In order to dualboot XP and OSX from the XP bootloader you have to do the following (supposing that XP is on the first partition and OSX on the second/third/…):

  • Copy the chain0 file located in /usr/standalone/i386 (or get it here) to the root of your XP partition
  • Modify the boot.ini file in the root of your XP installation (you’ll probably have to make it writable by unchecking Read-only in the file’s Preferences) and add the line:
C:\chain0=”Mac OS X86″
  • So it should look something like this:
[boot loader]
     timeout=30
     default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
     [operating systems]
     multi(0)disk(0)rdisk(0)partition(1)\WINDOWS=”Microsoft Windows XP Professional” /noexecute=optin /fastdetect
     C:\chain0=”Mac OS X86″
  • Make your XP partition active:
  1. Open "Computer Management" by right-clicking on "My Computer" and selecting "Manage"
  2. Select "Disk Management"
  3. Right-click on the XP partition (the first usually)
  4. Select "Mark Partition as Active"
  • Now you can easily select between the two operating systems from the windows bootloader.

Note: You can always get the OSX bootloader back by making the OSX partition (the second probably) active as described above

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