From owner-freebsd-questions Mon Sep 30 17:27:28 2002 Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 08DA337B401 for ; Mon, 30 Sep 2002 17:27:28 -0700 (PDT) Received: from rhymer.cogsci.ed.ac.uk (rhymer.cogsci.ed.ac.uk [129.215.144.8]) by mx1.FreeBSD.org (Postfix) with ESMTP id CE79243E81 for ; Mon, 30 Sep 2002 17:27:26 -0700 (PDT) (envelope-from richard@cogsci.ed.ac.uk) Received: from sorley.cogsci.ed.ac.uk (sorley [129.215.144.53]) by rhymer.cogsci.ed.ac.uk (8.9.3/8.9.3) with ESMTP id BAA05028; Tue, 1 Oct 2002 01:27:24 +0100 (BST) Received: (from richard@localhost) by sorley.cogsci.ed.ac.uk (8.9.3+Sun/8.9.3) id BAA18320; Tue, 1 Oct 2002 01:27:24 +0100 (BST) Date: Tue, 1 Oct 2002 01:27:24 +0100 (BST) Message-Id: <200210010027.BAA18320@sorley.cogsci.ed.ac.uk> From: Richard Tobin Subject: Re: how to use 'dd' to create image of a hard drive? To: "Jack L. Stone" , "Pranav A. Desai" , In-Reply-To: Jack L. Stone's message of Mon, 30 Sep 2002 19:10:06 -0500 Organization: just say no Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG > bs=102400 or bs=128k will dd faster though.... you can play with that. That's not my experience. 8k dd runs at disk speed (30-40 MB/s) on all the machines I've used recently when copying between different disks on different ATA controllers. Between disks on the same controller I only get about 13MB/s (why?) but there's no difference between 8k and 128k dd. -- Richard To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message