From owner-freebsd-questions@FreeBSD.ORG Sun Jan 25 06:21:52 2009 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 D948C1065670 for ; Sun, 25 Jan 2009 06:21:52 +0000 (UTC) (envelope-from keramida@ceid.upatras.gr) Received: from igloo.linux.gr (igloo.linux.gr [62.1.205.36]) by mx1.freebsd.org (Postfix) with ESMTP id 2EC778FC08 for ; Sun, 25 Jan 2009 06:21:51 +0000 (UTC) (envelope-from keramida@ceid.upatras.gr) Received: from kobe.laptop (adsl205-109.kln.forthnet.gr [79.103.18.109]) (authenticated bits=128) by igloo.linux.gr (8.14.3/8.14.3/Debian-5) with ESMTP id n0P6LUHk009084 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Sun, 25 Jan 2009 08:21:36 +0200 Received: from kobe.laptop (kobe.laptop [127.0.0.1]) by kobe.laptop (8.14.3/8.14.3) with ESMTP id n0P6LUA0056227; Sun, 25 Jan 2009 08:21:30 +0200 (EET) (envelope-from keramida@ceid.upatras.gr) Received: (from keramida@localhost) by kobe.laptop (8.14.3/8.14.3/Submit) id n0P6LTkv056226; Sun, 25 Jan 2009 08:21:29 +0200 (EET) (envelope-from keramida@ceid.upatras.gr) From: Giorgos Keramidas To: Polytropon References: <20090125021111.90661db0.freebsd@edvax.de> Date: Sun, 25 Jan 2009 08:21:29 +0200 In-Reply-To: <20090125021111.90661db0.freebsd@edvax.de> (Polytropon's message of "Sun, 25 Jan 2009 02:11:11 +0100") Message-ID: <874ozndhxy.fsf@kobe.laptop> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (berkeley-unix) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-MailScanner-ID: n0P6LUHk009084 X-Hellug-MailScanner: Found to be clean X-Hellug-MailScanner-SpamCheck: not spam, SpamAssassin (not cached, score=-3.971, required 5, autolearn=not spam, ALL_TRUSTED -1.80, AWL 0.43, BAYES_00 -2.60) X-Hellug-MailScanner-From: keramida@ceid.upatras.gr X-Spam-Status: No Cc: FreeBSD Questions Subject: Re: Comfortable dd bs= parameters for different media 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: Sun, 25 Jan 2009 06:21:53 -0000 On Sun, 25 Jan 2009 02:11:11 +0100, Polytropon wrote: > Hi, > > I'd like to ask which sizes are comfortable to use for reading > from different media using the dd utility. As far as I know, > these are good values: > > Format Device (example) bs= > ------------- --------------------- ---- > Data CD /dev/acd0 2048 > Music CD /dev/acd0t01 2352 > DVD /dev/acd0 2048 (?) > Hard disk /dev/ad0s1g 1m (?) AFAICT these are fine. > What about copying partition-wise from a hard disk to a dd file? > Which bs= parameter would be encouraged to use? Presumably the destination file will also be on hard disk (or USB flash, or SSD). It may be ok to use 1m then :)