8" disk drives and modern PCs

[Roy J. Tellason]

On Thursday 26 October 2006 19:51, Chuck Guzis wrote:
> On 27 Oct 2006 at 0:28, Tony Duell wrote:
> > YEs, but any correctly-designed disk controller would use open-collector
> > drivers, which will appear as floating outputs when powered down.
>
> The OP asked if the sequencing might make a difference.  Depending on
> design, it might--and powering the CPU then the drive appears to be
> safest.  Perhaps I should have phrased it that way.

Of the two setups I have which use an external HD interfaced to a CP/M box,  
my recollection is that it was done the other way around,  you'd power up the 
drive box first and shut it down last.  Not sure why that was,  though.

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