well, on my system, the PD drive shows up as both a scsi drive and
a scsi cdrom...
scsi0: Scanning channel A for devices.
Vendor: SEAGATE Model: ST15150N Rev: 0019
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sda at scsi0, channel 0, id 0, lun 0
Vendor: MATSHITA Model: PD-1 LF-1000 Rev: A109
Type: Optical Device ANSI SCSI revision: 02
Detected scsi removable disk sda at scsi0, channel 0, id 4, lun 0
Vendor: MATSHITA Model: PD-1 LF-1000 Rev: A109
Type: CD-ROM ANSI SCSI revision: 02
Detected scsi CD-ROM sr0 at scsi0, channel 0, id 4, lun 1
Vendor: iomega Model: jaz 1GB Rev: J.83
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi removable disk sda at scsi0, channel 0, id 5, lun 0
scsi : detected 1 SCSI cdrom 3 SCSI disks total.