[sebhc] H89 BOOT SUCCESS

dwight elvey dkelvey at hotmail.com
Tue May 22 22:36:22 CDT 2007

Hi Barry
Try it. You don't have to believe me. I make a lot of mistakes
over time with my older mind. Still, I'm quite sure about this
one, having actually done the experiments.

>From: "Barry Watzman" <Watzman at neo.rr.com>
>I don't buy the argument that the deflection yoke interferes with writing
>per se, but if it interfered with reading the headers, that could cause a
>What happens when you try to format a disk (a write operation that does not
>also involve a read)?
>-----Original Message-----
>From: sebhc-bounces at sebhc.org [mailto:sebhc-bounces at sebhc.org] On Behalf Of
>dwight elvey
>Sent: Sunday, May 20, 2007 17:47 PM
>To: sebhc at sebhc.org
>Subject: RE: [sebhc] H89 BOOT SUCCESS
> >From: "Barry Watzman" <Watzman at neo.rr.com>
> >
> >Re: "A surprise to most is that these stray magnetic fields have a 
> >effect on writing to the disk than they do to readingthe disk"
> >
> >I don't think that this is literally correct.  But keep in mind that
> >writing
> >requires reading first (the process of writing requires reading the 
> >headers before the actual writing begins).
> >
>Hi Barry
>I can read from the disk without error but as soon as the disk is
>written, it can no longer be read from. I've seen this several
>times and even experimented a little, to varify this.
>I suspect that the frequency is not high enough to get through
>the preamps on the drives. The read heads are only looking for
>sharp transisions.
>Writing needs to have a specific static level. Deviate from that
>level and no data is written.
>This is my guess.
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