From the "tech" section of the empeg website:

"HDD ports 2 ATA 2.5" HDD standard 2MM headers on main board HDD bays accept 17mm, 12.7mm or 8mm standard laptop drives with corner mounting screws.Serial IO Full 9-pin PC serial port on head unit, data rate to 230Kbits/s. TX, RX, GND, +12V @ 100mA on 300mm flying lead from docking connector, terminated in 9 pin female socket"

So they are IDE (in fact I'm not sure you can get notebook sized SCSI hard drives anymore, even Apple have been using IDE drives in their notebooks for years).

Can't see how you are going to attach an Jaz drive to it either.

Number 330 in the queue...