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Date: Mon, 30 Jan 2017 08:28:50 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: David Christensen <dpchrist@holgerdanske.com>
cc: freebsd-questions@freebsd.org
Subject: Re: FreeBSD 11.0-RELEASE-p7 i386 system drive imaging and
 migration
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On Sun, 29 Jan 2017, David Christensen wrote:

>> Writing SSDs with dd is not good, limiting their wear leveling.
>
> That's why I used zcat rather than dd for writing to the cloned SSD. If/when 
> I know enough to use zfs send/ receive, that will be best.

zcat is no different than dd in this case.  When you write a binary 
image, the SSD can't tell which blocks are truly in use, because they 
have all been written.