Check your S.M.A.R.T data. Look at the head park number. (Load cycles I think it is called, can't look it up now). If it is a six digit number, you are in trouble. For a server you want if to be in the same order as to power ups. Anything else and you have to explain to yourself "why?"

Edit: adding. The 1TB and smaller greens were disasters. I ruined a lot of them. I was told all of the 2TB and up greens didn't have head park issues, but spent part of last week replacing a storage unit populated with 2TB greens when a spindle failed (>200 unrecoverable blocks) and found that some of the 2TB greens were load cycling into the 200000 range, others weren't running up. They were all identical models purchased at the same time. Maybe they had different firmware? I replaced hem with REDs. They aren't supposed to park and they won't try to recover a bad sector for more than a few seconds so the don't hang your RAID when they get bad sectors.