From mboxrd@z Thu Jan  1 00:00:00 1970
From: Roberto Spadim <roberto@spadim.com.br>
Subject: Re: SSD - TRIM command
Date: Mon, 21 Feb 2011 20:52:47 -0300
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trim tell harddisk that those block are not in use

not in use block can be used by harddisk reallocation algorithm, like
spare sectors

hard disks can use TRIM command to 'create' 'good' blocks like spare sectors