Date: Sat, 7 Jul 2007 22:28:01 -0700 (PDT) From: Michael Eubanks <mse0206@yahoo.com> To: freebsd-chat@freebsd.org Subject: compressed HDD image using dd...clearing unused blocks Message-ID: <669580.92520.qm@web58104.mail.re3.yahoo.com>
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Hello all,
I am updating a system that has been around for some
time now. I would like to make a compressed disk
image after the final setup is complete, although, I'm
guessing that the unused blocks will not allow me to
compress the image as well as I could with a
previously clean disk (considering the disk has been
in use for some time now). Is there a way to do this
- zero out unused blocks to optimize compression? I
generally do this with Windows machines using the
cipher command (killing cipher after it has finished
writing zeroes). After running cipher I use dd to
create a compressed HDD image for later use. I'd like
to be able to do the same with FreeBSD.
-Michael S. Eubanks
mse0206@yahoo.com
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