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Date:      Thu, 28 Mar 2013 04:27:43 -0400
From:      Quartz <quartz@sneakertech.com>
To:        "Ronald F. Guilmette" <rfg@tristatelogic.com>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: Copying memstick image to a USB (flash/thumb) drive
Message-ID:  <5153FEFF.4090305@sneakertech.com>
In-Reply-To: <14008.1364453112@server1.tristatelogic.com>
References:  <14008.1364453112@server1.tristatelogic.com>

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> I have filed the following PR:
>
> http://www.freebsd.org/cgi/query-pr.cgi?pr=177431

Er, don't take my word for law: I have *no* idea if 1M is a good idea 
for most systems, I'm not even sure if it's optimal for mine. I did a 
single test with three random values at different orders of magnitude 
and picked the fastest. I do think that 10k is probably way under the 
right value, but someone should do proper testing on a variety of 
hardware before changing all the docs.

As for the conv=sync option, I'm not convinced it's necessary either 
way. I've dd'd zillions of images to various media over the years and 
have never specified a conv parameter and I've never had problems. I 
don't think modern systems really care what the end is padded with 
(provided nothing is corrupt of course). Someone with more experience 
would need to chime in on this.

______________________________________
it has a certain smooth-brained appeal



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