50Hz vs 60Hz fixed drive speed ?

From: Paul Koning <pkoning_at_equallogic.com>
Date: Tue Feb 17 15:12:52 2004

>>>>> "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
Received on Tue Feb 17 2004 - 15:12:52 GMT