Use of HDS722020ALA330 with MDADM

I am new to Hatachi Data Storage, met recently with a rep from BlueArc high performance storage systems. They spoke very highly of their use of Hatachi technology. I know there is quite a non-linear translation between quality of enterprise level products and consumer products. Recently picked up eight of the HDS722020ALA330 drives.

Does anybody have experience with these drives? I have built several arrays from the WD1001FALS but wanted to increase my density.

I couldn't find any resource on firmware updates or modification of things like ERC on these drives.