Re: Disk II Phase Question

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

Eric is right : the problem is the high diaphony of the head.
If the head was a better head with an accurate resolution so you'll write on
each track and "half track"
it's not the case :-(


"Bryan Parkoff" <nospam@nospam.com> wrote in message
news:LrGFd.1846$2e7.1013@newssvr12.news.prodigy.com...
> Eric,
>
> > The head physically has a gap between its poles.  The width of this gap
> > determines the width of the track that gets written to the disk.  In the
> > Disk II, the width of the head gap is more than 50% of the
track-to-track
> > spacing, thus making it impossible to reliably store data on two
adjacent
> > stepper-motor positions ("half-tracks").
>
>     I am not sure that I can understand your comment.  Is it true that
head
> writes data on track 5 which it contains valid data while extra unused
data
> can be written on track 4.5 and track 5.5.  Extra unused data is like
> invalid bit stream.  How can you draw a picture to explain what head gap
is
> for.
>
> Bryan Parkoff
>
>