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Add an example of using bs=2048 to duplicate data CD-ROMs.

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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
This commit is contained in:
Giorgos Keramidas 2009-01-23 03:46:44 +00:00
parent 8d91de92ee
commit 4dd47928b7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=187609
1 changed files with 5 additions and 0 deletions
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bin/dd/dd.1
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@ -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 ,