Drive Type International Memories, Inc. (IMI) 5012H

[Chuck Guzis]

On 7 Dec 2010 at 19:40, Tony Duell wrote:

> I seem to remember that some/most/all ST412-interfaced drives will
> assert an error signal if you select a head that isn't present (e.g.
> selecting head 6 on a 6-head (numbered 0 to 5) drice) or if you seek
> heyond the maximum cylinder. I've worked on several systems that use
> this to make sure the hard drive is the one they're xonfigured for and
> complain if it isn't (even it it haas more heads/cyliunders than are
> expected).

What most PC controllers return for a non-existent head is either 
"time out" or "sector not found"--and that seems to work.

--Chuck