If you make a morrored array, then as part of the creation process it will ask you permission to make a copy of the #1 SATA drive into the #2 SATA drive and from then on, once you boot into Windows it will be writing to both 160 drives. As his note suggests that data security is the goal, then this is the type of array he wants anyway.
Unless Horus has a controller I am not familiar with, he is not likely to be able to create an array between an IDE drive and a SATA drive.
Of course, nothing like this should be attempted without a backup of the original 160 drive, as a power failure or any number of other things could absolutely ruin his day <G>.