Hi,
I have the same Plextor as you,
do this
Code:
$ cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: MAXTOR Model: ATLAS10K4_36WLS Rev: DFV0
Type: Direct-Access ANSI SCSI revision: 03
Host: scsi0 Channel: 00 Id: 01 Lun: 00
Vendor: MAXTOR Model: ATLAS10K4_36WLS Rev: DFV0
Type: Direct-Access ANSI SCSI revision: 03
Host: scsi0 Channel: 00 Id: 04 Lun: 00
Vendor: PLEXTOR Model: CD-R PX-W4012S Rev: 1.02
Type: CD-ROM ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 05 Lun: 00
Vendor: TOSHIBA Model: DVD-ROM SD-M1711 Rev: 1005
Type: CD-ROM ANSI SCSI revision: 02
In your output you should see the Plextor just like that.
If its not there then you have a cable, SCSI ID, power, or some other problem.
First find out if it shows up and we'll go from there.