RAID-5 and RAID-6 suffer tremendously in their degraded state - instead of being able to read individual blocks from a single disk, you need to read all the dis

RAID-5 and RAID-6 suffer tremendously in their degraded state - instead of being able to read individual blocks from a single disk, you need to read all the disks (or all by 1 in RAID-6) for any blocks stored on the down drive.