Path: utzoo!mnetor!uunet!lll-winken!lll-tis!ames!nrl-cmf!mailrus!tut.cis.ohio-state.edu!bloom-beacon!mit-eddie!bbn!bbn.com!levin
From: levin@bbn.com (Joel B Levin)
Newsgroups: comp.sys.mac
Subject: Re: Jasmine Direct Drive 50 and a Plus
Message-ID: <23142@bbn.COM>
Date: 7 Apr 88 17:49:10 GMT
References: <23013@bbn.COM> <18879@think.UUCP>
Sender: news@bbn.COM
Reply-To: levin@CC5.BBN.COM (Joel B Levin)
Organization: BBN Communications Corporation
Lines: 29

In article <18879@think.UUCP> ephraim@vidar.think.com.UUCP (ephraim vishniac) writes:
:In article <23013@bbn.COM> I wrote:
:>I just got a Jasmine Direct Drive 50 for the office Plus, and I wanted
:>to pass along a small gotcha that you might keep in mind if you are
:>looking at hard disks.
:...
:>I was surprised to find the performance numbers substantially
:>lower than I had been led to believe they would be:

I would like to thank ephraim for explaining clearly and concisely why
the drive is behaving as it is.  I want to state again that I have no
complaint with the DD50.  It is miles above what I had been using (and
would be somewhat faster if I could swap my Plus for an SE).

The bottom line: due to less than perfect hardware in the Plus and
bugs in its SCSI manager, the Plus is unable to take advantage of the
drive and its cache; and also because of its cache the Disktimer II
seek test results are meaningless.
 ...
:How do I know this stuff?  I wrote Jasmine's SCSI driver.
 ...
:Ephraim Vishniac					  ephraim@think.com
:Thinking Machines Corporation / 245 First Street / Cambridge, MA 02142-1214

	/JBL


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