I'm sorry, I should have clarified: as far as I know, mdadm on RAID1 with consumer-grade spinning rust will not be able to save you from bit rot (or at least I

I'm sorry, I should have clarified: as far as I know, mdadm on RAID1 with consumer-grade spinning rust will not be able to save you from bit rot (or at least I haven't seen evidence to that effect). I haven't tried on RAID6 (where there's at least a chance due to the data duplication such that the flipped bit will be "out-voted" by the parity spindles).