[sebhc] H89 BOOT SUCCESS

Barry Watzman Watzman at neo.rr.com
Sun May 20 18:28:16 CDT 2007

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 greater
>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 
>requires reading first (the process of writing requires reading the sector
>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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