ST506 and/or ST412 hard disk drives - test-drb@ccmp.vtda.org

31 Dec 2007

...
   First, I'm not sure what you mean by ST506 and
ST412. I thought
 these were different in that one had a signal used for write precompensation
 while the other used the same line for a head select.  
Weren't both of those 4 head drives? THe ST412 is part of a family 
(ST406, ST412, ST419) which were 2, 4, 6 head drives from what I can see. 
I thought the ST506 was 4 heads but fewer cylinders.

I also thought the main difference between the ST506 and ST412 interface 
was that the latter alloewed buffered seeks, the former didn't

I am still curious as to what the 'speacial' signal is.

-tony