From owner-freebsd-questions@FreeBSD.ORG Mon Jul 23 10:02:57 2012 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id BC0D7106566C for ; Mon, 23 Jul 2012 10:02:57 +0000 (UTC) (envelope-from jakub_lach@mailplus.pl) Received: from sam.nabble.com (sam.nabble.com [216.139.236.26]) by mx1.freebsd.org (Postfix) with ESMTP id 91A648FC12 for ; Mon, 23 Jul 2012 10:02:57 +0000 (UTC) Received: from [192.168.236.26] (helo=sam.nabble.com) by sam.nabble.com with esmtp (Exim 4.72) (envelope-from ) id 1StFTc-0003EV-FP for freebsd-questions@freebsd.org; Mon, 23 Jul 2012 03:02:56 -0700 Date: Mon, 23 Jul 2012 03:02:56 -0700 (PDT) From: Jakub Lach To: freebsd-questions@freebsd.org Message-ID: <1343037776471-5729143.post@n5.nabble.com> In-Reply-To: References: <1342992043358-5729028.post@n5.nabble.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Subject: Re: "da0: 40.000MB/s transfers" What was rationale behind pegging USB 2.0 at 40MB/s? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Jul 2012 10:02:57 -0000 > i have never seen USB 2.0 exceeding 35MB/s write and 40MB/s read. That means I essentially got what I wanted- as high read output as possible on USB 2.0. Thanks. Indeed 35MB/s-40MB/s is common reported maximum throughput. > dd if=/dev/zero of=/dev/da0 bs=64k count=1 > newfs_msdosfs /dev/da0 Apart from bs= that's exactly what I did (Well, there was one /dev/random/ run prior.) What I previously meant is that I had such pendrive, that without former formatting in Windows, didn't even show up as device in FreeBSD- was completely useless. That does not mean I didn't newfs_msdosfsed it after that in FreeBSD (worked perfectly fine since) :) -- View this message in context: http://freebsd.1045724.n5.nabble.com/da0-40-000MB-s-transfers-What-was-rationale-behind-pegging-USB-2-0-at-40MB-s-tp5729028p5729143.html Sent from the freebsd-questions mailing list archive at Nabble.com.