classical wrote:

Bare in mind one factor - if anything goes wrong with your install (and 
this can be as simple as Mac OS X needing to update the boot caches 
after a software update), it will force a reboot into an OS that is 
natively supported. It's therefore worth keeping a "classic" 9.x 
partition around. You can use a 10.2 partition, but I've always found 
XPostFacto under 10.2 really, really unreliable and annoying (as it 
repeatedly asks for the admin password.) My Wallstreet with a 20GB hard 
drive has 9.1 and 10.2 natively installed (Both in the first 8GB, 9.1 is 
about 200MB or something like that), and the majority of the drive is 
10.3. If anything goes wrong, 9.1 will boot. I can then choose to boot 
from 10.2 using the 9.1 MacOS control panel or use XPostFacto to boot 
10.3. Remember.. if you use XPostFacto, you can NOT use the native OS X 
or Mac OS boot disk selection mechanism, you MUST use XPostFacto.

M
> Only the helper volume has to be smaller than 8GB and physically 
> within the first 8GB of the disk.  There is nothing special about the 
> helper volume.  It is just a named location within the first 8GB 
> where XPF can copy some boot information.  Having done that, the 
> actual OS can reside on any size of partition, anywhere.
> How small can your helper partition be?  The ".XPostFacto" file on my 
> helper disk is 86.6 MB.  Perhaps a 100MB partition might be safe 
> enough?


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