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Date:	Wed, 10 Aug 2011 08:54:53 +0100
From:	Ron Yorston <>
Subject: Re: Feature request: e2fsck -z

"H. Peter Anvin" wrote:

>It would be a very nice thing to have a flag to e2fsck, presumably -z,
>to zero out any unused data blocks, inodes and so on.  The goal is to
>minimize the amount of space required after compressing a virtual disk
>image or similar, and to make sure any non-data isn't lying around.

I wrote a separate utility, zerofree[1], that zeroes out free blocks.

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