The NSM4000 offers the same features and performance as the NSM7000 but with fewer slots and drives. Up to 7 drives and 415 media make the NSM4000 an ideal solution for high capacity data storage. * The NSM4000U Series models allow users to increase storage capacity using the existing chassis. Modular design architecture allows for scaleable drive and media slot counts, giving users a maximum of 3.76 TB of capacity.Basics Number of media slots** 260 to 415, Number of drives 1 to 7, Capacity max 3.76 TB , Media exchange time 4 sec. average, Intelligent Pack Technology 4, removable packs, CapacityDoublerTM Optional. SYSTEM Data interface Single/dual LVD-SCSI, Fibre Channel optional, Robotics control interface RS232/LVD switchable DRIVES Recorder Drive Multi-Drive, Data Transfer Rates DVD-R 8X: 11 MB/s. DVD-RAM 3X:4.1MB/s , CD-R 24X:3.6 MB/s. Access time 110 ms. Reader Drive DVD-ROM/R 9.0-22MB/s. Data Transfer Rates CD-ROM/R 8.2 MB/s. Access time 120 ms