Because one of the 1TB RAID1 drives was starting to fail...I was looking at options to replace it.
I original had a plan to upgraded one of my 1.5TB RAID1's to a pair of 2TB drives....freeing one of the 1.5TB drives to test out the OCE/ORLM feature of the RR622 & TR5M-BP on Zen...converting the current 2x1.5TB RAID0 to a 3x1.5TB RAID5 (or perhaps 4x1.5TB) Oops!Backup seems to be doing well and its filling up the space, I'm sure there's a setting to tell it not to, but not an issue at the moment. Guess I should buy it before the 30 day trial runs out.
At first I was looking at new 1TB drives....though for $20 more I could get 2TB drives, the same kind as the 6x2TB RAID10. The 1TB and 1.5TB drives have been 7200RPM (as were all previous drives)....the Hitachi's are the first of the greener drives....5940RPM. Given that I'm doing PM RAID in a first gen PCI Express box, I'm probably still not seeing the full potential of the greener drives.