I remember reading, some time ago [1] [2] about how many errors were expected without a complete failure of the HDD. I mean, the odds that you just read a rotte

I remember reading, some time ago [1] [2] about how many errors were expected without a complete failure of the HDD. I mean, the odds that you just read a rotten byte out from your disk. And how that would be enough to cause data loss, since you don't need 3 complete failures to loose data: perhaps 1 complete failure plus 2 partial HDD failures... And as HDD sizes grew larger, things would become complicate. To the point that the probability of loosing the second disk while still restoring the first one, since HDD sizes were so big that the time it takes to rebuild a whole 3TB disk is huge, in a environment that is in production, reading and writing things at the same time you're reconstructing the lost one. [1] This is one of such articles: http://searchdatabackup.techtarget.com/video/Preston-As-hard-drive-capacity-grows-so-does-risk-of-data-loss http://searchdatabackup.techtarget.com/video/Preston-As-hard... [2] this is another: http://www.zdnet.com/article/why-raid-6-stops-working-in-2019/ http://www.zdnet.com/article/why-raid-6-stops-working-in-201...