[Amps] Muffin Fans and hot exhaust/2

[Steve Katz]

> -----Original Message-----
> From:	Dr. David Kirkby [SMTP:davek@medphys.ucl.ac.uk]
> Sent:	Tuesday, July 23, 2002 6:29 AM
> To:	amps@contesting.com
> Subject:	Re: [Amps] Muffin Fans and hot exhaust/2
> 
> 
> 
> One manufacturer of hard drives (Fujitsu if memory servers me correct) has
> produced what has been billed as a silent drive. Clearly motors can be
> made
> very quite.
> 
> //It's not only Fujitsu, nearly all disk drive manufacturers are doing
> this nowadays.  But the "silence" comes from the use of laminates used in
> the stamping of the drive media cover.  Those used to be made from stamped
> single-layer cold-rolled metals in the past, and they amplified the
> spindle bearing and disk rotation noise; now, they're made from a
> tri-layer laminate having outside layers of cold-rolled steel and a
> middle, thin layer of resin (plastic), which acts as a rather excellent
> noise and vibration damper.  It's as simple as that.  In my work, we use
> the same materials all the time. -WB2WIK/6
> 
> 
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>