HP drives

[Tony Duell]

> 
> On 28 Dec 2010 at 16:52, Geoffrey Reed wrote:
> 
> > ISTR:  the 8" drives at least as used in tandy computers formatted out
> > to 77 tracks....
> 
> That's standard for all 8" drives--and it's "cylinders", please! 8" 
> drives can be double-sided with 2 tracks per cylinder.

I thought that at least the earlier Tandy 8" machines had single-head 
drives, in which case'track' == 'cylinder'.

I can't rememebr which machine it was, but one machine with 5.25" drives 
claimed to have '80 track' drives. What they actually were were 40 
cylinder, 2 head drives. So technically they did have 80 tracks, but it 
caused a lot of confusion at the time. 

-tony