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
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2020-12-20 02:59:44 +00:00
svn path=/head/; revision=187609
@ -392,6 +392,11 @@ Remove parity bit from a file:
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Check for (even) parity errors on a file:
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.Pp
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.Dl "dd if=file conv=pareven | cmp -x - file"
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.Pp
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To create an image of a Mode-1 CD-ROM, which is a commonly used format
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for data CD-ROM disks, use a block size of 2048 bytes:
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.Pp
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.Dl "dd if=/dev/acd0 of=filename.iso bs=2048"
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.Sh SEE ALSO
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.Xr cp 1 ,
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.Xr mt 1 ,
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