Re: Clock Bits On Disk Question

[dempson@actrix.gen.nz (David Empson)]

Michael J. Mahon <mjmahon@aol.com> wrote:

> David Empson wrote:
> 
> <snip>
> Again, a lovely and complete description of disk encoding--this
> should really find its way into the FAQ.  It certainly comes up
> regularly.  ;-)
> 
> >The problem is that the disk can reliably reproduce consecutive flux
> >reversals when read back, but prolonged absence of a flux reversal
> >produces unrelabile data readback. 
> 
> It may be useful to say why the prolonged absence of flux reversals
> is an issue.  [details snipped]

Thanks for the extra details, Michael.  I hadn't looked into this much
low level detail to fully understand why the zero bit reliability issue
arose, but it makes perfect sense now.

-- 
David Empson
dempson@actrix.gen.nz