I have seen about a billion ads and articles about iPods iPod mini. they use a 4 or a 6 gigabyte "minidrive". The geek in me wanted to know how big is a mini drive, anyway. Guess what? They never say! Well, I am going to spare you the same suffering I have endured. 5.5" - no 3.5" - no 1.0" - yes! Unbelievable! Wow! Of course i am still amazed by...never mind Don't have a clue about the rpm's, sorry. Recent Announcement by Hitatchi states that the will have a 20% smaller drive by years end with 8-10 gigabytes. I realize that most of you that care about this already know it, but for the rest of us, now you know! P.S. i guess if you use compact flash cards you already know about these, since they have hard drive compact flash cards for some time.