Note that the SuperMicro chassis uses 2.5" Serial Attached SCSI (SAS)[1] drives. The BackBlaze is using 3.5" SATA drives. Those are in a totally different cla

Note that the SuperMicro chassis uses 2.5" Serial Attached SCSI (SAS)[1] drives. The BackBlaze is using 3.5" SATA drives. Those are in a totally different classes. SAS drives are "enterprise" drives: faster and presumably more reliable that SATA, but lower density and higher priced. 2.5" SAS drives appear to top out at ~600GB and at a premium[2]. The 3.5" SATA drives used by BackBlaze are 1.5TB (probably more by now) and less expensive. [1] http://en.wikipedia.org/wiki/Serial_attached_SCSI http://en.wikipedia.org/wiki/Serial_attached_SCSI [2] http://www.google.com/search?q=2.5+sas+hard+drive&hl=en&client=ubuntu&hs=oS6&channel=fs&prmd=ivns&source=univ&tbm=shop&tbo=u&sa=X&ei=CaLATfTuLcHYgQeeyKDMBQ&ved=0CFsQrQQ&biw=1156&bih=538 http://www.google.com/search?q=2.5+sas+hard+drive&hl=en&...