Date: Mon, 20 Mar 2000 16:52:47 -0500 (EST) From: Brian Fundakowski Feldman <green@FreeBSD.org> To: FreeBSD MAIL <freebsd@mauibuilt.com> Cc: freebsd-hackers@freebsd.org, freebsd-questions@freebsd.org Subject: Re: 4.0 using dd and cdroms Message-ID: <Pine.BSF.4.21.0003201638420.30815-100000@green.dyndns.org> In-Reply-To: <200003202043.KAA10576@mauibuilt.com>
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Don't post to multiple lists; it's rude. I'll reply to both so others on -hackers won't think noone replied and reply, too. On Mon, 20 Mar 2000, FreeBSD MAIL wrote: > I have tried using dd on serveral 4.0 systems in order to capture an image off a cdrom. > > I tried dd if=/dev/acd0a of=file.img as well as on a scsi system (/dev/cd0a) and > eovery other cd device (/dev/acd0c /cdv/racd0c /dev/cd0c ect) and I get > > dd: /dev/acd0a Bad address > 0+0 records in > 0+0 records out Mode 1 CD-ROM DATA is 2352 bytes of data and ECC per block. The actual data returned from the drive is 2048 bytes, so each block is effectively 2048 bytes. Use ibs=2k or a multiple thereof. I've made a utility that does a nice job for CD duplication needs (the reading half), which you can find at: http://people.FreeBSD.org/~green/read_cd.tar.gz MD5 (read_cd.tar.gz) = 7881ea5ef1428ced7533b1cb2a3afbb1 > Thanks for any reply HTH > RP > puga@mauibuilt.com -- Brian Fundakowski Feldman \ FreeBSD: The Power to Serve! / green@FreeBSD.org `------------------------------' To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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