[Intel-devsys] IMAGEDISK for MDS 8" SSSD disks

Herb Johnson hjohnson at retrotechnology.com
Sat Feb 22 20:27:13 MST 2020

The DBIT adapter does an interesting thing. It counts tracks from 00 and 
when it gets above some value, it turns on the "greater than track 
whatever" write-comp signal. For some early 8-inch drives, they had no 
means to self-adjust for higher bit-density inner tracks. And if you 
read the drive manuals, there was no standard track-number among them. 
Later drives had the smarts to do this, so no external signal is needed.

If anyone has had marginal data problems that mostly occurred on inner 
(higher-number) tracks, this might be a symptom. Any comments?

Regards, Herb

On 2/22/2020 6:18 PM, Bill Beech (NJ7P) wrote:
> Roger,
> On 2/20/2020 8:06 PM, Roger Arrick wrote:
>> Now I have an SA800 8" drive going through a DBIT adapter which 
>> generates the T43 write comp signal.
> Can you provide more technical data on the dbit adapter?
> Bill
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Herbert R. Johnson, New Jersey in the USA
http://www.retrotechnology.com OR .net
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