We have a selection of cases to fit almost any application. You can make any SCSI hard drive we offer an external drive by purchasing a case from this category. Installation of drives in the case is FREE! We recommend fixed drive/case solutions for up to 4 SCSI hard drives. For more than 4 drives, we recommend SCSI hard drive enclosures, such as rack mountable storage arrays. We typically offer off-lease Dell Powervault arrays. Powervault 200S, 210S, 211S, 220S, 221S. They all have redundant power supplies and fans.