Msg: 6069 *Conference*
10-16-95 09:39:55
From: RON WIESEN
To : PAUL WHITING
Subj: REPLY TO MSG #6066 (IS MY PDD2 DYING?!)
I'm not familiar with Tandy drives. Disk drives generally have one or more threshold cyclinders (same as track number for 1-platter drives) where the electronics of the head read/write circuits switches for greater density. The magnetic density gets progressively greater as heads are moved toward the center (away from the edge) of the media. So when a "threshold cyclinder" is crossed, the read/write circuits receive a signal so that they may "compensate" for the new density. Perhaps Tandy drives have a threshold track and if so then your drive's symptoms indicate that the threshold signal is active, but the read/write compensation is not engaging or is not effective. Just my thoughts here. I'm no Tandy drive expert.