From mboxrd@z Thu Jan  1 00:00:00 1970
From: Phillip Susi <psusi@cfl.rr.com>
Subject: Re: SSD - TRIM command
Date: Mon, 21 Feb 2011 23:04:38 -0500
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To: Roberto Spadim <roberto@spadim.com.br>
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On 02/21/2011 10:29 PM, Roberto Spadim wrote:
> what device level could do? use a 'good block' (if exists) =>  dynamic
> reallocation
> 'good block' = block not in use by filesystem, not marked as bad, can
> be used by realloc

No.  It can only use blocks reserved for spares at manufacture time.  It 
can not use any old block that the fs is not using at the time, because 
the fs may choose to use it in the future.