----- Original Message ----- 
From: "Paul Koning" <paulkon...@comcast.net>
Sent: Monday, November 30, 2015 3:55 PM

> On Nov 30, 2015, at 3:45 PM, Fred Cisin <ci...@xenosoft.com> wrote:
> 
> Oversimplified remedial tutorial:
> Ideally, the system reads a sector, does what it has to do with the content, 
> and goes back for the next one, and can read every sector of the track in a 
> single revolution.
> ...
> It is USUALLY the same on every track, but there are rare exceptions. And 
> different disk formats from the same manufacturer may be different.

Your writeup was aimed at floppy disks, but interleave may also appear on hard 
drives.  I don't remember it in reasonably modern systems, but it shows up on 
CDC 6000 systems. 

----- Reply -----

Definitely an issue with IBM PC/XTs and clones; I recall testing every new 
combination of HD and controller for most efficient interleave before I 
delivered to the client.

m

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