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Date: Mon, 31 Aug 2015 15:57:14 -0400
From: Quartz <quartz@sneakertech.com>
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Subject: Re: Replacing Drive with SSD
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>physical blocks are
> not allocated to logical block addresses until the block is written to for
> the first time, so all blocks are spares until they are used and they can
> be returned to the spare pool using TRIM.

Ahh, ok. That was the missing piece of the puzzle. Thanks.