Hard-sector discs -- how many sectors?

Fred Cisin cisin at xenosoft.com
Fri Nov 20 19:24:02 CST 2009


On Sat, 21 Nov 2009, Philip Pemberton wrote:
> > The 3.5" disk doersn't have an index hole in the sense that the other
> > floppies do. You can't have a 'hard sectored blank disk', for this
> > reason. I suppose it would be _possile_ to make a drive that produced
> > multiple index/sector pulses per vevolution, but I've never seen one.
>
> That's effectively the question I was asking -- the discs don't support
> it, so did anyone bodge a PLL onto a drive to do it?

Has anybody bothered to checkout the innards of the first Tandy "Portable
Disk Drive" (for the Model 100)?   It has been referred to as having "hard
sectors", but uses an ordinary 3.5" floppy.





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