Momemade Alignment disk

On Sun, 26 Jan 2014, Chuck Guzis wrote: I fully believe that YOU or TONY COULD create a usable digital alignment diskette. I have NO doubts about that. The obvious problems don't seem that much past what even I could kludge. NOT necessarily a "duplicate". If I understand it correctly, the Dysan Digital Diagnostic Diskette has individual sectors "micro-stepped" out of position WITHIN a track! I have no idea how they do THAT! BUT, it would be relatively straight-forward to create a disk where entire TRACKS are "micro-stepped" out of position - instead of "are you reading more of the even-numbered V odd-numbered sectors?", it would be "are you reading more of the even-numbered V odd-numbered TRACKS". For data recovery, I had a couple of drives that I could move out of alignment, although admittedly, I had no calibration, nor software control of the movement, both of which would be essential for this task. OR with an off-axis hub, there would be an ANALOG V "digital" "micro-stepped" deviation in alignment within a track. With very careful positioning of index, that could produce a result that could be used similarly to the DDDD, maybe even usable with the same software! DDDD did not have different alignment between the beginning V end of the same sector; this would. Even if it weren't possible to produce calibrated offsets, a small collection of random offsets that then are measured COULD be used. But, how would you go about measuring the position? Would that be done with a special drive having a VERY narrow head, or would it have to be done optically with a "developing" mix? -- Grumpy Ol' Fred cisin at xenosoft.com http://www.xenosoft.com/FPUIB