From owner-freebsd-questions Fri Sep 21 20:52:27 2001 Delivered-To: freebsd-questions@freebsd.org Received: from lists.unixathome.org (lists.unixathome.org [210.48.103.158]) by hub.freebsd.org (Postfix) with ESMTP id 5300F37B408; Fri, 21 Sep 2001 20:52:24 -0700 (PDT) Received: from wocker (lists.unixathome.org [210.48.103.158]) by lists.unixathome.org (8.11.1/8.11.1) with ESMTP id f8M3qJj03695; Sat, 22 Sep 2001 15:52:21 +1200 (NZST) (envelope-from dan@langille.org) From: "Dan Langille" Organization: novice in training To: Greg Lehey Date: Fri, 21 Sep 2001 23:52:18 -0400 MIME-Version: 1.0 Subject: Re: copying from CD to CD Reply-To: dan@langille.org Cc: freebsd-questions@FreeBSD.org Message-ID: <3BABD2B2.14834.FCB94B8@localhost> In-reply-to: <20010922111217.A38715@wantadilla.lemis.com> References: <3BAB8A64.26207.EB13D33@localhost>; from dan@langille.org on Fri, Sep 21, 2001 at 06:43:48PM -0400 X-mailer: Pegasus Mail for Win32 (v4.0, beta 40) Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7BIT Content-description: Mail message body 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 On 22 Sep 2001 at 11:12, Greg Lehey wrote: > Data on CDs is written in blocks of 2 kB. By default dd reads 512 > bytes at a time, and the CD driver doesn't support this. It would > work if you use bs=2k. For the sake of efficiency, however, you > should select a larger block size, say 64 kB: > > dd if=/dev/cd0a of=/home/disc.iso bs=64k # dd if=/dev/cd0a of=/home/disc.iso bs=64k 9428+1 records in 9428+1 records out 617930752 bytes transferred in 180.846213 secs (3416885 bytes/sec) Works a charm. Thanks. YABIOY. cheers -- Dan Langille The FreeBSD Diary - http://freebsddiary.org/ - practical examples To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message