FWIW, my units (V1 unmodified BIOS) require a soft-boot before they'll recognize the SanDisk with a hard drive installed.
SanDisk only: Detects SanDisk (duh!)
SanDisk + CDROM: Detects both on power-up and subsequent reboots.
SanDisk + HDD: Detects only the hard drive on power-up. Ctrl-Alt-Deleting results in both devices being detected.
SanDisk + HDD + CDROM: On powerup and subsequent reboots, always detects HDD and CDROM - the SanDisk gets bumped off the bus correctly.
SanDisk + HDD + HDD: This is the only area where I have problems (V1 BIOS). The second hard drive doesn't seem to bump the SanDisk off the bus in the same way the CDROM does.
It's been a few months since I looked at this issue - but I recall *not* being able to solve it with proper (or improper, I remember trying!) jumpering of the hard drives.
Has anyone tried SanDisk + HDD + HDD with a newer BIOS and had success? (The goal here isn't to get all three - it's impossible - but to get the two hard drives to cooperate and kick off the SanDisk. The practical value of this would be that I sometimes use hard drives in removable caddies as "multi-gigabyte floppies". OK, not *too* practical... but it makes moving 8.4G of MP3s from one jukebox to another a snap