Roger, et al -- ...and then Roger Heflin said... % I have mixed many drives, I have never really had a major slowness. At Good to know. % worst you will be limited by the drive with the slowest seeks/transfer % rate. So long as one disk's RPM is not significantly different you should That's pretty much what I was wondering, but I imagine if it's the same RPM and the same cache and the same SATA rate it should be ... about the same. % not notice it, unless you are running your array right at the limit. Hmmph. I'm not entirely sure I'm not anyway, but it is just a little PC mobo running primary and daughtercard SATA ports. A Real Server (tm) is far, far beyond the current horizon :-) % % Technically you may want to also look at another parm that is the sustained % transfer rate range coming off the platter. This will be a range that is [snip] Oh, thanks! Sounds good. HAND :-D -- David T-G See http://justpickone.org/davidtg/email/ See http://justpickone.org/davidtg/tofu.txt