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From: cs472119@umbc5.umbc.edu (cs472119)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Speed of HardFrame/2000 and Quantum Q105S (problem) (longish)
Keywords: HardFrame, Quantum
Message-ID: <4550@umbc3.UMBC.EDU>
Date: 28 Nov 90 20:42:18 GMT
References: <3989.659757130@lemsys.UUCP>
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Organization: University of Maryland, Baltimore County
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Interleave that sucker, now!  I don't know about maxtransfer, but the short
pulses you see when loading a large file are caused by the computer
having to wait for disk latency.  

Say it reads from the first sector, but the controller can't keep up with
the drive to read the sector immediately following that one, so it waits
until the disk spins around again to get to that next sector.

If you interleave by say 1, consecutive sectors will be seperated from
eachother by sectors.  If you were to strecth out a disk with 8 sectors,
it might look like this:

   1 ! 5 ! 2 ! 6 ! 3 ! 7 ! 4 ! 8

   Read  Read    Read    Read
       ^      ^        ^      ^
      lag    lag      lag    lag

instead of this:

   1 ! 2 ! 3 ! 4 ! 5 ! 6 ! 7 ! 8

 Read   don't want...don't want..
      ^                         :
     lag                        :
                                :
.....Read    don't want.....
          ^                :
         lag               :


   This change will require you to reformat your Hard drive, and to choose
the interleave.  Be sure to explore the MAXtransfer thing first.

Hope this helped.
-Larry