Date: Fri, 30 Jan 2009 16:32:26 +0000 (UTC) From: Giorgos Keramidas <keramida@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-6@freebsd.org Subject: svn commit: r187924 - stable/6/bin/dd Message-ID: <200901301632.n0UGWQHj097100@svn.freebsd.org>
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Author: keramida (doc committer) Date: Fri Jan 30 16:32:26 2009 New Revision: 187924 URL: http://svn.freebsd.org/changeset/base/187924 Log: MFC 187922,187609 from /head Add an example of using bs=2048 to duplicate data CD-ROMs. This should be a bit useful for users who look at the manpage and then try to copy data CD-ROM disks using dd. A lot of us know that bs=2048 is required, but it still manages to cause a bit of grief to those who haven't heard about it. PR: bin/130857 Submitted by: Tri Brotoharsono < mail at tribrotoharsono.net > Modified: stable/6/bin/dd/ (props changed) stable/6/bin/dd/dd.1 Modified: stable/6/bin/dd/dd.1 ============================================================================== --- stable/6/bin/dd/dd.1 Fri Jan 30 16:28:32 2009 (r187923) +++ stable/6/bin/dd/dd.1 Fri Jan 30 16:32:26 2009 (r187924) @@ -32,7 +32,7 @@ .\" @(#)dd.1 8.2 (Berkeley) 1/13/94 .\" $FreeBSD$ .\" -.Dd August 15, 2004 +.Dd January 23, 2009 .Dt DD 1 .Os .Sh NAME @@ -392,6 +392,11 @@ Remove parity bit from a file: Check for (even) parity errors on a file: .Pp .Dl "dd if=file conv=pareven | cmp -x - file" +.Pp +To create an image of a Mode-1 CD-ROM, which is a commonly used format +for data CD-ROM disks, use a block size of 2048 bytes: +.Pp +.Dl "dd if=/dev/acd0 of=filename.iso bs=2048" .Sh SEE ALSO .Xr cp 1 , .Xr mt 1 ,
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