On Linux at least you can do. The Linux PCMCIA is bright enough to follow
the rules about pre-initialised devices. It realises the card has an owner
and leaves well alone.
> The PC110 has an interesting level of BIOS support for the PCMCIA slots.
> If you are using an ATA card as a BIOS device in one slot, you are very
> constrained as to what will run on the other slot. If you load the
> full PCMCIA drivers, you lose BIOS ATA support, which can be
> problematic if the card was a boot device.
This sounds like some kind of windows driver problem. You may be forced to
use CF on Windows if so.