Date: Fri, 23 Jan 2009 03:46:44 +0000 (UTC) From: Giorgos Keramidas <keramida@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r187609 - head/bin/dd Message-ID: <200901230346.n0N3kisr030250@svn.freebsd.org>
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Author: keramida (doc committer) Date: Fri Jan 23 03:46:44 2009 New Revision: 187609 URL: http://svn.freebsd.org/changeset/base/187609 Log: 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 > MFC after: 3 days Modified: head/bin/dd/dd.1 Modified: head/bin/dd/dd.1 ============================================================================== --- head/bin/dd/dd.1 Fri Jan 23 03:15:28 2009 (r187608) +++ head/bin/dd/dd.1 Fri Jan 23 03:46:44 2009 (r187609) @@ -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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