I've been reading and attempting to do this for a few hours now, and get as far as the boot screen to choose which OS to boot. I am booting from 2 different HDs, one having Vista and the other with Leopard. When I choose Microsoft Windows Vista -- everything works fine. However when I choose Mac OS X, i get a "B0 error". What does this mean and how do I go about fixing it?

Also, when I installed Kalyway 10.5.2 everything worked up until the restart. I seems to freeze at "MACH reboot". A few lines above it I noticed a line of text that read: localhost configd[41] <Error>: server_shutdown bootstrap_register(): service name already exists. I'm not sure if that is the cause of the freezing or not.

I extracted boot0.gpt to my C: root.
In the windows command prompt I did as follows:



And as mentioned above, once restarted the boot menu appears with Vista and OS X as the options. Vista option loads properly. OS X gives me a B0 error.

Can anyone shed any light on what to do from here?

What do u mean B0 error?

You should ask yourself a question whether or not vista boot manager can boot an OS from another HDD. Darwin, for instance, cannot.

I have the same problem basically. From what I've read, using boot0.gpt should work to chain boot OSx installed on a second drive partitioned with the GPT scheme. Vista loader is just "booting" boot0.gpt, which is just a hex image of a boot program. It is supposed to search for the HFS+ partition on a GPT drive and then boot it. My understanding is that it doesn't matter too much about which physical drive or partition OSx lives on, much like the chain0 booter, only it supports GPT. Anyhow, I think I gett a "Boot1: error" with this.

Using a bootloader such as GRUB may solve your problem. Also check whether your OSX partition is active or not. Try this:
Boot OSX with -s option and at command prompt use these commands.

fdisk -e /dev/rdisk<disk no.> (check your disk no. where OSX is installed)
flag 1 (1 is the partition no.)
write
update
quit
reboot