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From: | Brad Campbell |
Subject: | Re: [Qemu-devel] Wipe patch |
Date: | Wed, 02 Aug 2006 07:09:36 +0400 |
User-agent: | Thunderbird 1.5.0.4 (X11/20060615) |
andrzej zaborowski wrote:
I don't know if you mean just zeroing unused parts or reordering the data and stuff like defragmentation. If you mean the former, there's a universal method: dd if=/dev/zero of=xxx; rm xxx where xxx is a path to a new file on the filesystem, which must be mounted. It will creata a zero filled file there, which will fill all availiable space, and remove the file afterwards. I used this when I needed to send filesystem images through internet so that they compressed well.If you add dd=<a-big-number-here> it might take less time to write the file.Oops, I mean "bs=" ofcourse.
Yep, been doing similar, but the neato wipe programs generally also do cluster tails and unused directory entries and allow a really great compression ratio. Ta for the advice though.
Brad -- "Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so." -- Douglas Adams
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