These guys at ‘backblaze’ claim to be able to provide 67TB for $7,867 based on 45 SATA drives, RAID6 (Linux) and JFS. The hardware design which is presented in the blog as a how-to uses vertically stacked drives and looks very much like the Sun ‘Thumper’ (X4500) device which I first saw when I was still at Sun around 2006. No performance numbers are given, and whilst the capacity is much cheaper than ‘real’ storage, I doubt that write performance is much to write home about.