MegaMacs offers the Promise VTrak E-Class 12TB Serial ATA RAID Subsystem, model no. E610fD, for $3,999.99 with free shipping. That’s the lowest total price we could find for this model by $2,305. This 3U rack mountable enclosure houses 16 750GB Serial ATA 3Gb/s hard drives, each running at 7200 rpm. It also features two RAID controllers (which support RAID 0, 1, 5, and 6), four external 4Gb fibre channel, two SCSI, and redundant power supplies and cooling modules, and more.