Date: Wed, 09 May 2001 17:13:56 -0400 From: Walter Betancourt <walt@betan.com> To: "PC Doc" <pc-doc@worldnet.att.net> Cc: freebsd-questions@freebsd.org Subject: Re: Use DD to make image copy of dual boot drive? Message-ID: <4.2.2.20010509170845.00bbec70@pop3.palace.net> In-Reply-To: <001001c0d8ca$3e500980$0864a8c0@mlg.org>
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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
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