Three configurations are available: an internal SCSI, external SCSI and an external USB 2.0 version. ProDATA drives are also equipped with a 16MB cache, much higher than other optical storage drives. A larger cache reduces errors by easing the load on the CPU. Combined with the protective cassette, ProDATA drives are designed to be resistant to dust and other airborne contaminants, enhancing data integrity and hardware durability.Andrew Darlow is Editorial Director of Digital Imaging Magazine. His free Inkjet & Imaging Tips Newsletter can be subscribed to by sending a blank e-mail(no subject needed) to: Inkjettipsemail@example.com. To submit article ideas for Digital Imaging magazine(especially how-to's and pro tips), contact Andrew at AD@andrewdarlow.com.