I’ve known for a while the importance of partition alignment both for raid and for the (not so)new 4k harddrives.
Thinking about sector size of 512 bytes VS. 4k for newer drives, I’ve been a bit puzzled by the fact that 512 bytes x 4 = 4k .
I’ve read articles explaining the size of mbr causing unalignment, but I’ve yet to find an article explaining this issue more clear than http://www.thomas-krenn.com/en/wiki/Partition_Alignment .