Date   : Mon, 05 Mar 1984107:45:00-PST
From   : meier%isl@AMSAA.ARPA
Subject: Alignment of disk drives with DDD (Dysan Diagnostic Disk)

X
       I am trying to use DDD version 1.1 and Dysan Diagnostic Disk
to align a pair of Shugart 800 disk drives with a Disk Jockey 2D Controller.
I think that I have set the constants in DDD appropriately and I have been
able to adjust the disks so that they pass the DDD tests, but there has been
no noticeable improvement in the performance.  I have been unsuccessful
thus far, but I suspect that the major problem is that I don't understand
the readings that I am getting from DDD.  In particular, what are reasonable
readings when doing the centering test.  The current symptoms are that I get
a BAD SECTOR error about once every 12 hours with single density and with
double density, the surface of the disk inside the about track 10 is all
BAD SECTORS.  I would appreciate any help or suggestions that anyone is
willing to offer.
                                       Bob (isl!meier@shasta)