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From: "Michael W. Lucas" <mwlucas@bigbrother.rust.net>
Message-Id: <199709051432.KAA29913@bigbrother.rust.net>
Subject: problem using dd to duplicate hard drive
To: freebsd-questions@freebsd.org
Date: Fri, 5 Sep 1997 10:32:56 -0400 (EDT)
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Hello,

I'm trying to use dd to duplicate a hard drive.  I have two identical
Western Digital 2.5 gig drives, even the same model number.  

I used

dd if=/dev/rwd0 of=/dev/rwd1

to do the duplication, as per various archived postings.

However, when I try to boot off the disk, I get a warning like:

/dev/rwd0s1f: /dev/rwd0s1f:  BAD SUPER BLOCK: VALUES IN SUPER BLOCK
DISAGREE WITH FIRST ALTERNATE

Then the oh-so-familiar "run fsck, press enter for sh".

I run fsck, and get a floating point exception.  fsck exits on signal 8,
with the same warning as above.

Any thoughts on how to fix this?

(The eventual goal is to create a single master hard drive that we can use
to quickly reproduce servers for customers: any other suggestions on how
to accomplish this would be greatly appreciated.)