I am building a direct attached storage (DAS) case that I will attach to my workstation using an external SAS card. External RAID DAS cases for SAS drives are not cheap so homemade it is! So far I have been assembling the parts, I have the drives, case, and lots of wires. I will do a more in depth video of the whole process later. You could use this as part of a NAS if you wanted.
