Raid 1 is just mirroring I think, and so the speed will not be any different, maybe a slight overhead in sending the data twice, but on todays computers it makes no noticeable difference, RAID 0 is splitting where the PC splits data over 2 drives to make it faster, it WILL be faster on read/write times, but only noticeable on huge files, also your pc may boot faster, random access speed wont be any different, if you want 'snappyness' get a 10k or 15k rpm drive