Date: Fri, 21 Sep 2001 23:52:18 -0400 From: "Dan Langille" <dan@langille.org> To: Greg Lehey <grog@FreeBSD.org> Cc: freebsd-questions@FreeBSD.org Subject: Re: copying from CD to CD 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
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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
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