nStor offers the Industry's Highest-Performing Ultra320 SCSI storage solution available in a 3.5-inch (2U) rackmount or deskside tower configuration. The NexStor™ 4000S is configurable in either Dual (standard) or Single (optional) bus mode, offering up to 640 MB/s data transfer rates. The 4000S is a JBOD (Just a Bunch Of Disks) with 12 of the fastest 10,000RPM or 15,000RPM disk drives per system. With the addition of a RAID upgrade, the NexStor 4000S can be configured into an Ultra320 SCSI PCI/PCIx RAID solution or an active/active, fault-tolerant Ultra160 RAID solution, providing unparalleled performance in any data-computing environment.