Sector Interleave

Mike Stein mhs.stein at
Mon Nov 30 16:09:59 CST 2015

Nothing wrong with what you wrote that I can see; excellent tutorial IMO.


----- Original Message ----- 
From: "Fred Cisin" <cisin at>
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at>
Sent: Monday, November 30, 2015 4:45 PM
Subject: Re: Sector Interleave

>>> 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.
>  From: "Paul Koning" <paulkoning at>
>> 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.
> On Mon, 30 Nov 2015, Mike Stein wrote:
>> ----- 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.
> 1) Are there any examples newer than PC/XT 5160?
> Although, obviously, completely hidden from the user, is it still used on 
> anything "modern"?
> (Should ALL verbs be changed to past tense?)
> 2)  Is it used on anything besides spinning rust?
> 3)  Besides all of my examples being floppy, what else should be 
> changed/corrected in what I wrote?

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