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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
>>
>>
>>
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>
>Walt
>
>
>To Unsubscribe: send mail to majordomo@FreeBSD.org
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Walt


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