50Hz vs 60Hz fixed drive speed ?

From: Tom Uban <uban_at_ubanproductions.com>
Date: Tue Feb 17 15:30:02 2004

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
> >
> >
> >
>
>---
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Received on Tue Feb 17 2004 - 15:30:02 GMT