Date: Wed, 9 May 2001 15:44:02 -0700 From: "Ted Mittelstaedt" <tedm@toybox.placo.com> To: "Walter Betancourt" <walt@betan.com>, <pc-doc@worldnet.att.net> Cc: <freebsd-questions@FreeBSD.ORG> Subject: RE: Use DD to make image copy of dual boot drive? Message-ID: <003701c0d8d9$8bb0da60$1401a8c0@tedm.placo.com> In-Reply-To: <4.2.2.20010509171910.00bc29e0@pop3.palace.net>
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you can speed this up by defining bs=16384 Ted Mittelstaedt tedm@toybox.placo.com Author of: The FreeBSD Corporate Networker's Guide Book website: http://www.freebsd-corp-net-guide.com >-----Original Message----- >From: owner-freebsd-questions@FreeBSD.ORG >[mailto:owner-freebsd-questions@FreeBSD.ORG]On Behalf Of Walter >Betancourt >Sent: Wednesday, May 09, 2001 2:21 PM >To: pc-doc@worldnet.att.net >Cc: freebsd-questions@FreeBSD.ORG >Subject: Re: Use DD to make image copy of dual boot drive? > > >please excuse the thumbs, > > dd if=/dev/ad0 of=/dev/fd1 should read dd if=/dev/ad0 of=/dev/ad1 > > >At 05:13 PM 5/9/01 -0400, you wrote: >>Having been told that dd can make a bootable identical copy if >both drives >>have >> >>the same geometry, >> >>I did sucessfully dd if=/dev/ad0 of=/dev/fd1 with 2 WD 10.2 GB drives >>(same model) >> >>setup as master and slave. >> >>12 hours later I had an identical system running with the cloned >hard drive. >> >> >> >>At 01:54 PM 5/9/01 -0700, you wrote: >>>Hi, >>> >>>I have what's probably a dumb question, so please forgive my ignorance. >>> >>>I have a FreeBSD system (2.2.8, yes, I know it's old, it's >getting rebuilt >>>as soon as 4.3 seems to settle down) that is dual booted with >Windows 98 on >>>the first partition and FreeBSD 2.2.8 on the second. >>> >>>I have two seemly identical 6.4 GB drives. One is WD and the other is a >>>Quantum. Both show exactly the same number of cylinders, heads, SPT, and >>>total number of sectors. I'd like to make a complete image copy >(roughly) of >>>the primary drive (wd0) to the second drive (wd1), which would >include both >>>the 98 and the FreeBSD partition. >>> >>>Can I do this using DD? Assuming I could boot into an >"emergency" shell, is >>>that a "memory" file system for root? Meaning both of the two >file systems / >>>and /usr would be synced and closed. >>> >>>I've tried Drivecopy 4, disabling the smart sector copy so it should copy >>>everything, but it gets an error part of the way into the >FreeBSD partition, >>>and I've had the system reboot when I get to a certain point in a tape >>>backup. Something's probably wrong either with the disk or the >file system, >>>but I see any errors in the log (that I can recognize as errors) >>> >>>Is copying the whole disk, sector by sector doable with DD? What >would the >>>command be? I think the 'c' partition refers to the whole disk so I would >>>guess something like: >>> >>>dd if=/dev/rwd0c of=/dev/rw1c bs=??? >>> >>>I'm not sure about the devices and what would be a good block size. Do I >>>need to use 512 bytes? The disks say: 32-bit mult-block-16 so >that that mean >>>an "efficient" block size would be 16x512? Or would a track (63x512) be >>>better? >>> >>>Any clues for the clueless would be greatly appreciated. I'll >get the hang >>>of this yet! >>> >>>Thanks, >>>Mark >>> >>> >>> >>>To Unsubscribe: send mail to majordomo@FreeBSD.org >>>with "unsubscribe freebsd-questions" in the body of the message >> >>Walt >> >> >>To Unsubscribe: send mail to majordomo@FreeBSD.org >>with "unsubscribe freebsd-questions" in the body of the message > >Walt > > >To Unsubscribe: send mail to majordomo@FreeBSD.org >with "unsubscribe freebsd-questions" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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