[Coco] Formatting HD floppies w/ modified controller.

[Mark Marlette]

Gene,

I have one of these disks. Got it off of Ebay last year. Works GREAT 
on drive alignments.

I spent $15.

Mark

At 10/7/2005 11:34 PM, you wrote:
>On Friday 07 October 2005 20:42, Robert Gault wrote:
> >OK, just in case it might make a difference, I told format to use 135
> >TPI and 80 tracks for the 3.5" disk. With the current v3.02.05 that
> >means dmode dns=7, typ=21, and cyl=50. Format ran to completion with no
> >errors creating $B40 sectors.
> >
> >I don't believe I have any way of actually determining the track density
> >of a disk. Someone can let me know if there is readily available
> >software that can do this, not just report a header value.
>
>Dyson used to make a standard test disk, but I haven't seen one of them
>puppies in 20 years, Robert.  It was also quite pricey, about 100 bucks.
>Made for the servicers of the drives, it contained tracks with such
>things as azimuth wobble, tracks with lots of noise in the guard bands,
>that sort of thing.  You could align a 40 track drive to an accuracy in
>the micron range with it.  The one I saw was for 40 track (48 tpi) drives,
>and I'd assume they also made one for the 80 track (96 tpi) stuff, but I
>never had the pleasure of seeing one of those.
>
>The biggest downfall for Dysons potential market was that you absolutely
>couldn't convince the techs of the day that it couldn't be copied.  They
>had no concept of the requirements of the drive that actually made that
>disk, and I've seen techs trying to use copies and wondering why they
>weren't seeing the stuff on the scope that the original disk could do.
>
>--
>Cheers, Gene
>"There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
>-Ed Howdershelt (Author)
>99.35% setiathome rank, not too shabby for a WV hillbilly
>Yahoo.com and AOL/TW attorneys please note, additions to the above
>message by Gene Heskett are:
>Copyright 2005 by Maurice Eugene Heskett, all rights reserved.
>
>
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