dricci, you've got the right idea. The upside of the way UNIX handles RAM is that you aren't strictly limited performancewise the way you were with classic Macintosh or the way Windows users still are (not quite the same, but the Windows implementation of RAM management doesn't work nearly as well as that of UNIX); the downside is that there is no way to set aside a particular chunk of RAM. Honestly, and I've always had as much RAM as my Macintoshes could hold, the only really useful application of a RAM disk I ever found was running SETI@home--it was MUCH faster when running on a RAM disk, but, in the cosmic scheme of things (horrible pun intended!), this one little use is, in my book, no great loss.