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 - 15:10:11 GMT