From owner-freebsd-questions@FreeBSD.ORG Thu Mar 28 08:27:51 2013 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id 69547ED3 for ; Thu, 28 Mar 2013 08:27:51 +0000 (UTC) (envelope-from quartz@sneakertech.com) Received: from relay02.pair.com (relay02.pair.com [209.68.5.16]) by mx1.freebsd.org (Postfix) with SMTP id 10C6667B for ; Thu, 28 Mar 2013 08:27:50 +0000 (UTC) Received: (qmail 10859 invoked by uid 0); 28 Mar 2013 08:27:43 -0000 Received: from 173.48.104.62 (HELO ?10.2.2.1?) (173.48.104.62) by relay02.pair.com with SMTP; 28 Mar 2013 08:27:43 -0000 X-pair-Authenticated: 173.48.104.62 Message-ID: <5153FEFF.4090305@sneakertech.com> Date: Thu, 28 Mar 2013 04:27:43 -0400 From: Quartz User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:10.0.2) Gecko/20120216 Thunderbird/10.0.2 MIME-Version: 1.0 To: "Ronald F. Guilmette" Subject: Re: Copying memstick image to a USB (flash/thumb) drive References: <14008.1364453112@server1.tristatelogic.com> In-Reply-To: <14008.1364453112@server1.tristatelogic.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-questions@freebsd.org X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 Mar 2013 08:27:51 -0000 > 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