Date: Wed, 09 May 2001 17:20:45 -0400 From: Walter Betancourt <walt@betan.com> To: pc-doc@worldnet.att.net Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Use DD to make image copy of dual boot drive? Message-ID: <4.2.2.20010509171910.00bc29e0@pop3.palace.net> In-Reply-To: <4.2.2.20010509170845.00bbec70@pop3.palace.net> References: <001001c0d8ca$3e500980$0864a8c0@mlg.org>
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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
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