Re: Disk II Phase Question

["Jplcsch" <jplcsch@wanadoo.fr>]

Eric you're right.

Bryan, the only thing you can do with half track is a schem of  protection
as ECA (look Archon etc...)
Even in this case you write only few datas on each half tracks. If you need
some sources I can send a disk image .dsk and you transfert with ADT on
Apple (sources are under Merlin)

An other thing you can do is to write on 1/4 track but it's instable but it
work,  you must be care with the time delay between two phases.

One thing it's absolutly impossible to do, is to write like a spirale from
track 0 (or any other) look the connection of the phase one and you'll
understand.


"Eric Smith" <eric-no-spam-for-me@brouhaha.com> wrote in message
qh8y6xcdk8.fsf@ruckus.brouhaha.com">news:qh8y6xcdk8.fsf@ruckus.brouhaha.com...
> "Bryan Parkoff" <nospam@nospam.com> writes:
> >     Do each even/odd track have total ($5F00) 24,320 bytes in nibble?
Is it
> > safe to write data to all 70 tracks (even/odd tracks) once, but not more
> > than one time?  Then read data from all 70 tracks to see if data is
still
> > valid.  It is very dangerous to read and write all 70 tracks because of
> > overwriting if possible, but it is best to write once while read more
than
> > one time for valid data.
>
> No.  The head gap is wider than half of the track pitch.  If you write
> track 0, then write track 0.5, you will not necessarily be able to read
> track 0 back reliably, though at that point you should be able to read
> track 0.5 reliably.
>
> If it was possible to reliably store 70 tracks worth of data on a
> Disk II, everyone would have been doing it many years ago.