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From: amurai@tama.spec.co.jp (Atsushi Murai)
Newsgroups: comp.os.386bsd.misc
Subject: Re: Experience with double-speed CD drives? (esp Toshiba 3401b)
Message-ID: <AMURAI.94Jan1162707@tama.spec.co.jp>
Date: 1 Jan 94 21:26:53 GMT
References: <1993Dec31.202224.813@cs.wisc.edu>
Sender: amurai@tama.specgw.co.jp (Atsushi Murai)
Organization: System Planning and Engineering Co.,Ltd
Lines: 43
In-Reply-To: jcargill@oka.cs.wisc.edu's message of 31 Dec 93 20:22:24 GMT
In article <1993Dec31.202224.813@cs.wisc.edu> jcargill@oka.cs.wisc.edu (Jon Cargille) writes:
Does anyone have any experience with double-speed CD-ROM drives? If
so, what sort of bandwidth are you seeing from the drive?
The reason I ask is that I recently purchased a Toshiba 3401b, which
is supposed to achieve 330Kb/s. However, when I use "dd" to read from
the raw device, I get only about 200Kb/s.
Is anyone else getting better performance from a similar drive? If
so, what sort of speeds do you see when you execute:
dd if=/dev/cd0d of=/dev/null
^^^^<--????(Real Raw Device?)
If you want see *sort of bandwith* for Toshiba 3401b, you have to
dd through the Real Raw Device like follows.
bash# time dd if=/dev/rcd0a of=/dev/null bs=64k
1105+0 records in
1105+0 records out
72417280 bytes transferred in 214 secs (338398 bytes/sec)
214.79 real 0.02 user 1.21 sys
bash#
Note: NetBSD0.9 + bt742a + 486 33Mbytes + 256KB Cahche 32Mbytes DRAM
on kterm(Kanji xterm) + Xfree86 2.0
Thanks for any info,
I hope you have *A Happy New Year* ;-)
Jon
--
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Jon Cargille jcargill@cs.wisc.edu
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and fast turnaround. Call today!
Atsushi.
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Atsushi Murai Email: amurai@spec.co.jp
System Planning and Engineering Co,.Ltd. Voice: +81-33833-5341