>         Would including the drive's capacity in the table help the
>         matches? (Assuming both NetBSD and the BIOS can both correctly get
>         this value).

No.  In fact, it would be *less* likely to work, because the BIOS may
report a different value than the drive (not just because of geometry
issues, but also due to things like reserving an area of the disk for
APM save-to-disk).