The MCB3064SS magneto-optical drive delivers capacities up to 640 mega-bytes on a single disk and data transfer. This drive offers an extensive range of capabilities. - SCSI-2 version - Internal data transfer rate up to 4.7 MB/sec -Up to 30% faster write performance with Over-Write media - Conforms to ISO (International Standards Organization) standards - 640MB, 540MB, 230MB or 128MB rewritable disk options