[syslinux] chain.c32 question

[Tomas M]

I'd like to use chain.c32 to allow the computer boot from HARDDISK if 
needed.

If I use isolinux and boot from CD, the following works OK:
chain.c32 hd0

But if I boot from USB Flash Key, it sometimes work and sometimes it 
doesn't and I have to use
chain.c32 hd1
(it seems BIOS assigns hd0 to the flash key sometimes, so the real 
harddisk is hd1 in that case).

Is there any way to tell chain.c32 to SKIP the device chain.c32 is 
running from? So it will skip hd0 here and proceed the next harddisk. Or 
is there any other solution, except the one to create two menu entries 
in syslinux.cfg with "boot from C: and boot from D:" ?


Thank you

Tomas M