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From: byoder@smcnet.smc.edu (Brian Yoder)
Newsgroups: comp.sys.ibm.pc
Subject: Re: wd1006 and Norton SI
Summary: The answers to your Norton SI Questions
Keywords: 1:1 interleave, data transfer and access time
Message-ID: <1990May2.212143.19819@smcnet.smc.edu>
Date: 2 May 90 21:21:43 GMT
References: <1782@cybaswan.UUCP>
Organization: Peter Norton Computing
Lines: 31

In article <1782@cybaswan.UUCP> eehamid@cybaswan.UUCP (ia.hamid) writes:
>	I have just finished installing a WD1006-MM2 HD controller into my
>386-20 machine and reformated my ST251-1 at 1:1 interleave using Disk Manager.
>	I had a WA2 controller which gave only an optimal interleave of 2 and
>data transfer rate of 200 Kb/s. That was slowing down my machine performance
>somewhat. I noted some performance figures before removing this controller;

>	Norton SI 	: 21.1 (Adv. 4.5)
>	       DI	:  3.4 (Disk Index)
>	       PI	: 15.1 (Performance INdex).  

>With the new controller operating, I have done a similar test but to my own
>astonishment none of the figures above changed. I can understand why SI index
>remained the same but I expect some changes in the DI and PI figures! Can
>anyone out there enlightened me please ?

The DI statistic is a combination of two figures.  One is the data transfer
rate from the disk which might not change with the addition of your new
controller.  The other is a measurement of track-to-track seek time. Again
this may not change with a new controller.  Future versions of SI will
include more than just these two factors in your disk performance
index.

Good Luck,
Brian Yoder

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