Wow... the numbers in this paper are surprising, to me, at least. https://www.usenix.org/conference/fast-08/analysis-data-corruption-storage-s... Note that this research was presented at FAST '08, seven (7) years ago. Anecdotal evidence suggests the situation hasn't gotten much better - BERs have stayed pretty steady over that time AFAIK, but the size of disks has gone up. That means the likelihood of problems on any given disk has gone *up*. Ouch. -- -Adam Thompson athompso@athompso.net