I wouldn't RAID dissimilar drives. Some controllers won't let you do it anyway, and some will, but it's flaky when you do. And personally, I wouldn't trust Samsung drives in a stripe anyway, unless you just absolutely don't care about your data. If you're just set on setting up an array of some sort, at best, i'd raid two of the F1's in a stripe, and leave the other two as standalone drives. You can raid 3 of the f1's, but you increase your chance of array failure with every drive you add to a stripe. It only takes one to fail to lose everything on the array. If your controller will let you put dissimilar drives in an array, you might do a RAID 10. That would give you 2tb of redundant storage, with the speed of a RAID 0.