50Hz vs 60Hz fixed drive speed ?

From: Jay West <jwest_at_classiccmp.org>
Date: Tue Feb 17 15:27:51 2004

fixed, 14" platters 7900/7905/7906

----- Original Message -----
From: "Tom Uban" <uban_at_ubanproductions.com>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk_at_classiccmp.org>
Sent: Tuesday, February 17, 2004 3:30 PM
Subject: Re: 50Hz vs 60Hz fixed drive speed ?


> Were those fixed disks or removable?
>
> --tom
>
> At 03:10 PM 2/17/2004 -0600, you wrote:
>
> >at least on the limited number of HP drives I've worked on, it's always a
> >different hub pully for 50hz vs. 60hz.
> >
> >Jay
> >----- Original Message -----
> >From: "Paul Koning" <pkoning_at_equallogic.com>
> >To: <cctalk_at_classiccmp.org>
> >Sent: Tuesday, February 17, 2004 3:12 PM
> >Subject: Re: 50Hz vs 60Hz fixed drive speed ?
> >
> >
> > > >>>>> "Tom" == Tom Uban <uban_at_ubanproductions.com> writes:
> > >
> > > Tom> A friend and I were discussing 8" floppy drives recently, in
> > > Tom> particular that they often have two pulley sizes so that the
> > > Tom> rotational speed is 360rpm regardless of 50Hz or 60Hz operation,
> > > Tom> assuming that they are setup properly.
> > >
> > > Tom> The question then turned to whether or not a fixed hard drive
> > > Tom> would typically be designed in a similar fashion, such that the
> > > Tom> spindle would rotate at the same number of RPM when configured
> > > Tom> for 50Hz or 60Hz operation, or if they did not worry about the
> > > Tom> speed differences as the media was not removable?
> > >
> > > Looking at some DEC drives in the Peripherals Handbook.... the RS04
> > > fixed disk (head per track) drive spins slower with 50 Hz power.
> > > Various removable pack drives (RP04, RK03, RP03) all show a single RPM
> > > spec but two models, one 50Hz, one 60Hz. Of course, voltage is
> > > another consideration.
> > >
> > > A Maintenance manual would give more detail about whether there really
> > > are two different pulleys or the like, but the data suggest that this
> > > is indeed the case for the removable drives.
> > >
> > > paul
> > >
> > >
> > >
> >
> >---
> >[This E-mail scanned for viruses by Declude Virus]
>
>

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Received on Tue Feb 17 2004 - 15:27:51 GMT

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