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From: clarson@ux.acs.umn.edu (Chaz Larson)
Newsgroups: comp.sys.mac.hardware
Subject: Quantum HD's
Message-ID: <1030@ux.acs.umn.edu>
Date: 18 Jan 90 19:49:35 GMT
Reply-To: clarson@ux.acs.umn.edu (Chaz Larson)
Organization: University of Minnesota, ACSS
Lines: 22


A friend just bought a Quantum ProDrive 40, which was advertised as
having "12ms access time."  However, SCSI Evaluator reports this time
as being _22ms_.  I tried the same test on my SE/30's Quantum 40
[mine is Apple-supplied] and got the same results.  What's going on
here?  has he gotten a bum drive, or what?

The only explanation I have been able to formulate is that the 12ms
figure is based on access through direct SCSI calls, rather than
going through the driver, but I haven't gotten around to backing up
my drive in order to try that particular SCSI Evaluator test.  Does
this make sense?

Specifics on the two systems:
1. Mac SE (May '87), Internal "Club Mac" Quantum ProDrive 40, Uni-Mac
   formatting software, System 6.0.4, SCSI Evaluator 1.03
2. Mac SE/30 (May '89), Internal Apple 40SC [Quantum mech], HD Setup
   formatter, System 6.0.4, SCSI Eval 1.03

Any ideas?

<chaz>