Disk drive parts

[Tony Duell]

> of this I have parts for about 6 of these (I think), Diablo model 30 high
> density (512B sect) drives, which on DEC I think would be an RK03. It was a

Yes, the DEC RK03 is the high density Diablo model 30.

> 2.5 MB removable cartridge disk with a stepping motor for the head
> positioning. I can take pictures if this is not sufficient. These were used

Are you sure about that? The model 30 I know used a permanent magnet 
brush motor for the head postiioner, with a rack and pinion mechanism to 
actually move the heads. Feedback came from a couple of PCBs on top of 
the motor spindle, the tracks of which effectively formed transformers.

-tony