Sector Interleave

[Charles Anthony]

On Mon, Nov 30, 2015 at 1:45 PM, Fred Cisin <cisin at 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.
>>>
>>
>  From: "Paul Koning" <paulkoning at comcast.net>
>
>> 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?
>
>
Probably outside the domain of the question:

The DPS8-M had configurable core memory bank interleave (even/odd
addresses);  I would hazard a guess that this improved bandwidth on double
word read/writes.

 -- Charles