Date: Mon, 5 Nov 2012 00:58:50 -0600 (CST) From: Robert Bonomi <bonomi@mail.r-bonomi.com> To: freebsd-questions@freebsd.org, freebsd-questions@herveybayaustralia.com.au Subject: Re: Questions about dump/restore to/from DVD media Message-ID: <201211050658.qA56wo7J042603@mail.r-bonomi.com> In-Reply-To: <509751D5.7060902@herveybayaustralia.com.au>
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> Date: Mon, 05 Nov 2012 15:42:45 +1000 > From: Da Rock <freebsd-questions@herveybayaustralia.com.au> > Subject: Re: Questions about dump/restore to/from DVD media > > On 11/05/12 14:14, Polytropon wrote: > For reference, if one did backup the whole slice/disk using dd and then > compressed the data, would that effectively compress all those > 'unallocated' nodes? NO. The unallocated' blocks still have whatever data was in them. *IF* you copy /dev/zero to a new file, to fill the disk, then rm -that- file, the compression will be higher. 'How much' depends on how empty the disk is.
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