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Path: sserve!newshost.anu.edu.au!munnari.oz.au!sgiblab!swrinde!elroy.jpl.nasa.gov!ames!koriel!sh.wide!wnoc-tyo-news!rena!cnvxjp!omnis.co.jp!specgw!tama!amurai 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 -- -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-. Jon Cargille jcargill@cs.wisc.edu Want your .sig compressed? Reasonable rates and fast turnaround. Call today! Atsushi. -- Atsushi Murai Email: amurai@spec.co.jp System Planning and Engineering Co,.Ltd. Voice: +81-33833-5341