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Date: Fri, 30 Dec 2016 13:38:43 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: Heikki Lindholm <holindho@saunalahti.fi>
cc: freebsd-questions@freebsd.org
Subject: Re: Fwd: system -invalid argument 1m #### dd
 if=FreeBSD-11-RELEASE-amd64-memstick.img of=/dev/sdb1 bs=1M  conv=sync
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On Tue, 27 Dec 2016, Heikki Lindholm wrote:

> Needs to be
>
> dd ... bs=1000000
>
> Not every dd understands bs=1M

True, but in this case not quite the problem.  Note what the user said 
they typed ("1M") does not match the error message ("1m").

In short, Linux dd pretends to not understand a lower case "m" as 
megabytes.  Why Linux is strict here, I don't know.  FreeBSD's dd 
accepts upper or lower-case "m".