Path: utzoo!censor!geac!jtsv16!uunet!cs.utexas.edu!usc!polyslo!cosmos.acs.calpoly.edu!dhom
From: dhom@cosmos.acs.calpoly.edu (David Hom)
Newsgroups: comp.sys.apple
Subject: SCSI HD Interleave
Summary: Will GSOS allow you to set Interleave
Keywords: SCSI, harddrive, interleave, GSOS
Message-ID: <13662@polyslo.CalPoly.EDU>
Date: 18 Aug 89 03:43:53 GMT
Reply-To: dhom@cosmos.acs.calpoly.edu.UUCP (David Hom)
Distribution: usa
Organization: Cal Poly State University -- San Luis Obispo
Lines: 30

Remember SCSI Hacker, the program that allowed you to set your
interleave on a hard disk to optimize it for the I/O speed of
the GS...

***BOTTOM LINE***  IS THERE ANY WAY TO FORMAT A SCSI DRIVE UNDER
SYSTEM SOFTWARE 5.0 TO SOMETHING OTHER THAN 1:1 or 2:1 TO TRY TO
INCREASE I/O SPEED?

Here's the story...

I first did a low level format with SCSI Hacker.  Then, I ran
HDPartition to write a device partition map.  I then booted into
the finder and a dialog box asking me whether or not I wanted
to format my SCSI drive appeared.  I answered yes (knowing that
with System Software 4.0 when the finder detected a DPM, it did
only a High level (OS) format.  System software 5.0 has the 
facility to choose an interleave of 1:1 or 2:1 for SCSI drives
so I chose 1:1 thinking it would realize the drive already had 
a valid DPM.  When I clicked format, the finder did a low level
format, completely obliterating my previous interleave.  

I repeated the lowlevel format and DPM creation and tried to format
from the finder and ADU.  The Finder and ADU ignored the DPM and
proceeded with a lowlevel format.  

There's the story. Thanks for any help.

David

dhom@cosmos.acs.calpoly.edu