Tony,

On Wed, 17 Jan 2007 16:54:52 +1100, Tony Smith wrote:

>...
> Once the power is off, the platters will run down due to friction.  I'm not
> sure drive platters make good flywheels, not much mass. 

These days perhaps, but in the Good Old Days of 14" ten-disk platters on mainframes, if the power failed they'd spin for about 15 minutes!  Very eerie 
to be in a computer room illuminated by emergency lights, with no sound but the very quiet whine from half a dozen disk drives.  Normally they'd be 
braked to a halt, so it was only in a power failure that it would happen.

Cheers,


Howard Winter
St.Albans, England


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