try : cat /proc/scsi/scsi if you see something like : ------------------------------------ Attached devices: Host: scsi0 Channel: 00 Id: 05 Lun: 00 Vendor: UMAX Model: Astra 1220S Rev: V1.3 Type: Scanner ANSI SCSI revision: 02 Host: scsi0 Channel: 00 Id: 06 Lun: 00 Vendor: IOMEGA Model: ZIP 100 Rev: J.02 Type: Direct-Access ANSI SCSI revision: 02 ------------------------------------ it's ok. your scanner must be : /dev/sg0
else you will have to compile your own kernel with the support of your scsi card.