md5sums not matching with isos and dvds

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Dear All

I use the script

-------------------------------------------
#!/bin/sh

blocos=`echo $(( $(ls -l "$1" | awk '{ print $5 }') / 2048 ))`
disksum=`dd if=/dev/dvd bs=2048 count=$blocos | md5sum - "$1"`

echo "$disksum"
-------------------------------------------

to check whether a data dvd has been well recorded (comparing its
md5sums with the md5sums of the corresponding iso file). However, with
a certain iso file, I always get two not matching md5sums. The media
that I am using is a Philips DVD+RW, and the recording speed is low
(4x). Any ideas?

Thanks in advance,

Paul


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