dd command to copy a cd to a hard disk - Input/output error

[Daniel]

Hello All,
I wonder if anyone can help me please:
I have tried to copy a cd to hdd on Mandrake 8.1 and Redhat 7.2 (I've done 
it before, but this time it's not working):

dd if=/dev/cdrom of=Mandrake82-cd1-inst.i586.iso
dd: reading '/dev/cdrom': Input/output error
1332304+0 records in
1332304+0 records out

The original cd works, so perhaps the problem lies with the block size 
which I should specify in the format:
dd if=/dev/cdrom ibs= ???k of=Mandrake82-cd1-inst.i586.iso obs=???k

Am I on the right track?  Is there an easier or more logical way of 
figuring out the correct input or output block sizes?
Do both need to be specified?
At: http://www.linuxdoc.org/HOWTO/CD-Writing-HOWTO-4.html
I found what follows.  I have created the file and made it executable and 
as bash isn't in the path done 'sh file.sh' and I get an error on 
'do'.  Perhaps there's an alternative?
+++++++++++++++
#! /bin/bash

RD=/dev/cdrom
for i in 32768,7   32776,32 32808,32 32958,128 33086,128 33214,128 
33342,128 33470,32 33581,16 33598,16  33615,16  33632,16
do
     old_IFS="$IFS"
     IFS=","
     set -- $i
     IFS="$old_IFS"
     OFFSET=$1
     LENGTH=$2
     echo "*`dd if=$RD bs=1 skip=$OFFSET count=$LENGTH   2> /dev/null`#"
done
++++++++++++++++
Any help would be greatly appreciated.
Thanks,
Daniel. 


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