(1) The wizard recommended two hard drives for caching, despite saying that, by using those drives, I could get a speed increase of up to '0 times'.
(2) The wizard advised me to use a RAM cache, and perhaps (I can't remember) recommended using unallocated memory (which is a wonderful feature), but used on *allocated* memory.
(3) I received a 'cache cannot be allocated' error (or some such) when the wizard tried to do its work (= allocating one hard disc as a cache - I'd told it not to use another hard drive it had picked), two flash drives (already with a cache on them), and 1 gig system RAM.