I am looking to purchase a few low cost drives for a RAID array in various servers using either LSI 9271-8i or Adaptec 5805 RAID controllers (i have many of each). What I am trying to determine is what drives I can get away with purchasing. I see NAS drives cost less than enterprise sata drives, my concern is if they will have similar problems to consumer grade sata drives. I have been able to determine that NAS drives have slightly higher vibration and are a little slower than enterprise drives, but other than that, no differences are noted. The higher vibrations limit the NAS drives to a maximum of 4 in an assembly or physical mount to keep vibration from becoming an issue that degrades a volume. Can anyone add to what I have found or for that matter correct me on anything?