"..Both hold 100 discs, both offer up to four readers. The big change, naturally, is in the inclusion of Pioneer's own DVD-ROM reader, the DVD-102. (This SCSI-2 device will soon be superceded by the new DVD-103S, a "Generation Three" 6X reader now shipping from Pioneer.
The DVD-102 readers that currently ship with the V40 are, as mentioned, SCSI-2 units with a maximum throughput of 2.8 to 3.5MB/sec for DVD, 1.4 to 3.6MB/sec for CD-ROM. (That's 2.6X for the DVD side, 24X on the CD-ROM side.) The drive is slot-load, which thus differs significantly from the drives available in other jukeboxes with their caddy- or tray-loading approaches.."