On Sun, 3 May 1998, Tony Duell wrote:
> > I've used other, larger disk drives (14" CDC drives in particular)
> > where a magnetic index sensor is used to detect speed. If you attempt
> > to spin one of these drives up without the sensor operating, they will
> > go over-speed, but won't self destruct (yes, I've tested this.) After
>
> I have to ask : did you test this on purpose, or did you forget to plug
> the sensor in ? :-)
>
> > detecting that they apparently haven't spun up to speed in time, they'll begin
> > the spin-down sequence.
>
> I guess some problems on the Micropolis 1200 would cause the
> microcontroller to think the drive hadn't spun up and then disable the
> motor. It's also quite possible that the motor in said drive can't run
> fast enough to cause major damage anyway (but I'm not going to try it!)
>
> >
> > Same goes for the RL01/RL02 (which will spin about 3000 RPM instead
> > of nominal if you convince them to spin up without a pack).
>
> Yes, but with no pack there's no platter to break up :-)
True, but you might make quite a 'copper splash' with the armature
windings!
- don
> I'm not going to try it, but what does an RL0x do if you get it to
> overspeed with a pack in place, I wonder? Probably not a lot.
>
> >
> > Tim.
> >
>
> -tony
>
>
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Don Maslin - Keeper of the Dina-SIG CP/M System Disk Archives
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Received on Sun May 03 1998 - 19:14:50 BST