ST-506 hard drive emulation

[Gordon JC Pearce]

Tony Duell wrote:

> OK, I have an ST412 (maybe an ST506, it's one of the early ones) where 
> the hall effect sensor in the spindle motor has failed. Now, it should be 
> possible given a moderate clean room to dismantle the heads and platters 
> (and that's the only way that spindle motor will come out), but then 
> what? It was put together with a press, there are probably ferrofluid 
> seals on the shaft, etc. It's not going to be easy to take apart and get 
> togerther again. I know I don't have the tools to do it.

Can you get at any rotating part of the motor?
Simple enough to graft on your own hall-effect sensor...
Gordon.