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-rw-r--r--bin/dd/dd.15
1 files changed, 5 insertions, 0 deletions
diff --git a/bin/dd/dd.1 b/bin/dd/dd.1
index 31a5d3e..579035c 100644
--- a/bin/dd/dd.1
+++ b/bin/dd/dd.1
@@ -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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