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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!news.mira.net.au!vic.news.telstra.net!act.news.telstra.net!psgrain!iafrica.com!uct.uni.net.za!csir.uni.net.za!wits.uni.net.za!howland.erols.net!EU.net!usenet2.news.uk.psi.net!uknet!usenet1.news.uk.psi.net!uknet!dispatch.news.demon.net!demon!awfulhak.demon.co.uk!awfulhak.demon.co.uk!awfulhak.demon.co.uk!not-for-mail From: brian@anorak.coverform.lan (Brian Somers) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: Read/Write CDROM strategy Date: 4 Nov 1996 04:10:26 -0000 Organization: Coverform Ltd. Lines: 35 Sender: brian@awfulhak.demon.co.uk Message-ID: <55jqbi$1ta@anorak.coverform.lan> References: <kxrE02F6o.CGu@netcom.com> Reply-To: brian%anorak.coverform.lan@awfulhak.demon.co.uk NNTP-Posting-Host: anorak.coverform.lan X-NNTP-Posting-Host: awfulhak.demon.co.uk Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Newsreader: knews 0.9.8 In article <kxrE02F6o.CGu@netcom.com>, kxr@netcom.com (Keith Rich) writes: : : I think I could use a Read/Write CDROM to do backup, but I'm not sure : about the strategy to use. I think the write has to happen all at once, : so I think I want to dd from a disk image to the raw device. I imagine : having a disk image the same size as the CDROM, and probably on a scratch : disk. So, it would work like this. : : put the stuff to be backed up on the scratch disk : dd if=/dev/raw_disk of=/dev/raw_cdrom : : The intent here is to end up with a CDROM that can be mounted and looked : at directly rather than having to restore it to disk first. : : Now come the hard questions. : : Do I copy the partition stuff as well as the filesystem? : Can I backup both dos and unix stuff unto the same CDROM? : Can I end up with a CDROM that I can boot from? : What about bad blocks? Can I get bad block info off the CDROM first? : Are there any limits that will preclude the whole idea? : Has anybody tried this yet? : What hardware issues are relevant (e.g.: ide versus scsi)? : : Comments? Have a look at "mkisofs". Once you've built your 9660 filesystem, I think you've gotta look at J"org's "od" driver. -- Brian <brian%anorak.coverform.lan@awfulhak.demon.co.uk> <http://www.awfulhak.demon.co.uk/> Don't _EVER_ lose your sense of humour.... .