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[Tony Duell]

> I think the early Sony 3.5" drives used a 26-pin header arrangement 
> to answer someone else's question.

Certainly some early Sony 3.5" drives used a 26 pin header. They exist in 
both single and double sided versions, and IIRC there are subtle changes 
to the interface btween them (the single-sided one uses 1-of-n select 
lines, the doublesided one has 2 lines binary-encoded). 

These drives (often?) rotate at 600rpm, and can't easily be replaced with 
PC drives. 

-tony