True, but if he's only reading, the present frequency is plenty. The
assumption is that the write precomp on the already-written media is
sufficient. If it's not the data might never have been readable.
Dick
----- Original Message -----
From: <allisonp_at_world.std.com>
To: <classiccmp_at_classiccmp.org>
Sent: Wednesday, July 05, 2000 6:59 AM
Subject: Re: Tim's own version of the Catweasel/Compaticard/whatever
<snip>
> > I will admit, MFM *does* require at least twice the timing resolution of
FM.
> > I once got in a small argument with some other members of this list
about
> > AC circuit design of MFM vs FM data recovery circuits. IIRC, they were
> > insisting that MFM did come "for free" if you had the frequency response
> > necessary for FM at half the data rate. My point was that it
> > wasn't the max pulse frequency which made life difficult, it was the
phase
> > response (finding where the pulse occured in the window) that was the
tough
> > point.
>
> Also since precomp ranges from .0625uS to as long as .375uS the ability
> to slice a bit finer is a desireable thing.
>
> Allison
>
>
>
Received on Wed Jul 05 2000 - 10:39:44 BST