Date: Fri, 26 May 2000 03:10:38 -0700 (PDT) From: julian@FreeBSD.ORG (Julian Elischer) To: hackers@freebsd.org Cc: msmith@freebsd.org, sos@freebsd.org Subject: Dell-7500 + Atapi CD-R wierdness Message-ID: <20000526101038.A394937B544@hub.freebsd.org>
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I have an atapi CD-R drive in my laptop. under windows I created a disk, using the Adaptec CD-DIRECT software. (UDF-1.50) now I'm using it as a sample of a UDF 1.50 filesystem fo my UDF code. however I've hit something rather puzzling: if I do dd if=/dev/acd0c of=stuff and analyse that file, I get different results than if I access the drive directly. in a similar vein, when I randomly access block 108362, I get block 108362, but when I access the disk sequentially, I find that data at block 108366, 4 blocks away. Does anyone have any clues? Specifically I've heard stories of CDrom devices having very 'approximate' seeking, but this is a bit much, and I thought that was only when in audio mode.. -- __--_|\ Julian Elischer / \ julian@elischer.org ( OZ ) World tour 2000 ---> X_.---._/ presently in: Perth v To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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