From owner-freebsd-questions@FreeBSD.ORG Thu Mar 28 06:45:18 2013 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.FreeBSD.org [8.8.178.115]) by hub.freebsd.org (Postfix) with ESMTP id 549924C2 for ; Thu, 28 Mar 2013 06:45:18 +0000 (UTC) (envelope-from rfg@tristatelogic.com) Received: from outgoing.tristatelogic.com (segfault.tristatelogic.com [69.62.255.118]) by mx1.freebsd.org (Postfix) with ESMTP id 39ACEEA8 for ; Thu, 28 Mar 2013 06:45:17 +0000 (UTC) Received: from segfault-nmh-helo.tristatelogic.com (localhost [127.0.0.1]) by segfault.tristatelogic.com (Postfix) with ESMTP id A14803AE43; Wed, 27 Mar 2013 23:45:12 -0700 (PDT) From: "Ronald F. Guilmette" To: Quartz Subject: Re: Copying memstick image to a USB (flash/thumb) drive In-Reply-To: <5153A2FD.8020804@sneakertech.com> Date: Wed, 27 Mar 2013 23:45:12 -0700 Message-ID: <14008.1364453112@server1.tristatelogic.com> 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 06:45:18 -0000 In message <5153A2FD.8020804@sneakertech.com>, you wrote: > >> Why exactly is the "bs=10240" is there? Wouldn't the default of 512 >> do just as well? > >Modern systems can read and write far more than 512 bytes per operation. >Sticking with 512 would work perfectly fine, but you'd be imposing an >unnecessary bottleneck and the copy would be a lot slower overall. >Whether 10K is optimal or not depends on the exact hardware you're >messing with (it looks pretty low to me, I'd suggest more like 1M). I agree. And 10 kibibytes is probably quite a bit less than optimal. I have filed the following PR: http://www.freebsd.org/cgi/query-pr.cgi?pr=177431 Thank you for your reply. Regards, rfg