I read in sci.electronics.design that Terry Pinnell
wrote (in
) about 'PC CPU fan', on
Mon, 3 Oct 2005:

Thanks Glenn. All 3 of my HDs are Maxtors (2 x 60GB, and this latest
200GB), and all are 7200 rpm. Are you speculating that one might be
spinning at 432.000 kHz, and the other at 432.001 kHz?!

I think you multiplied by 60. 7200 RPM is 120 Hz.
--
Regards, John Woodgate, OOO - Own Opinions Only.
If everything has been designed, a god designed evolution by natural selection.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk