There's some good info at http://newsgroups.derkeiler.com/Archive/Comp/comp.sys.ibm.pc.hardware.storage/2006-02/msg00044.html

In the samples above, disk() is always 0, rdisk() is the only thing that changes. You may just need to change disk(1) to disk(0) in your boot.ini.

It's possible the XP boot loader can't handle loading Win7; in that case, you may need to make the Win7 disk the first boot disk, and edit its boot.ini file (in the hope that the Win7 boot loader can load XP, which seems likely).

>I have been hacking the boot.ini file in my xp install. I now have a menu but I can't get win7 to boot. I am guessing what the syntax should be. I am not sure what rdisk()? Anyone have an idea what I did wrong?
>
>

>[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 /usepmtimer
>multi(0)disk(1)rdisk(1)partition(1)\WINDOWS="Microsoft Windows 7 Premium" /fastdetect
>

>
>>I can only change the order of the drives in the BIOS to boot xp or win7. No menu.
>>
>>>Did you try it and didn't get the boot menu?
>>>
>>>>
>>>>I can do that but I was hoping for the dual boot menu.
>>>>
>>>>>See if you can set HD with Win7 the first in the boot sequence in the PC BIOS.
>>>>>
>>>>>>I purchased another drive and installed windows 7 Home Premium on it. I assumed that the dual boot menu would be setup so I could choose which version to boot. Everything I have read talked about creating another partition but I can't seem to find anything about using another drive. The install is done but I can only boot XP. I located the boot.ini file on C: driver but I am not sure that will work. Any ideas on how to fix this?
>>>>>>
>>>>>>Thanks.