Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!uunet!island!hue
From: hue@island.COM (Pond Scum)
Newsgroups: comp.periphs.scsi
Subject: Re: More advice sought for r/w optical system
Message-ID: <3777@island.COM>
Date: 5 Mar 91 21:15:31 GMT
References: <1991Feb13.134708.3440@news.larc.nasa.gov> <3721@island.COM> <1991Feb25.045950.17710@odin.corp.sgi.com>
Sender: usenet@island.COM
Organization: Island Graphics Corp., San Rafael, CA
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In article <1991Feb25.045950.17710@odin.corp.sgi.com> olson@anchor.esd.sgi.com (Dave Olson) writes:
>In <3721@island.COM> hue@island.COM (Pond Scum) writes:
>| SCSI Magneto-Optical drives typically write around 70k bytes/sec.  In order
>I don't know where you got your info, but even the slowest M-O
>drive I saw (an old sony) wrote at 100Kbytes/sec WITHOUT pre-erasing.

garbonzo% time dd if=/dev/zero of=spud bs=256k count=20
20+0 records in
20+0 records out
0.0u 1.3s 1:02 2% 0+440k 6+652io 1pf+0w
garbonzo% dc
256 1024 20 * * p
5242880
62 / p
84562
garbonzo%

Vendor: SONY    
Product: SMO-C501-00     
Rev. Level: 2.07
Formatted in ISO mode

So what I really see is 82k bytes/sec, over 3X slower than you say it should
be (70k might have been on a SPARCstation 1).  The machine is a SPARCstation 2,
SunOS4.1.1, Delta Microsystems smo driver, 1k byte/sector media.  Do you think
this drive has ancient firmware?  We've bought three in the last few months
(from Delta Microsystems and Artecon) and they all perform about the same.


-Jonathan		hue@island.COM