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Media check for Mandriva 2006


Scirious
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you can do an md5sum check on your isos, as described here. if you're in linux you can mount the drive and do a md5sum on the actual media too. also, most burning applications have an option to "verify written data".

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My ISO images are ok. I've already checked them. But some of my CDs arent't and I don't know which. I'm going to reburn those that are problematic, but I don't know which they are. So I need to check them and, as they are already burned, I don't know if K3B can help me.

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As a rule don't burn at over 4x, over 4x you will probably get bad burns.

I wouldn't say "probably", but there's more of a chance ;). I burn 25x on a regular basis without any issues.

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I found this script here http://www.troubleshooters.com/linux/coasterless.htm#rawread for Linux

#!/bin/sh
device=$1

blocksize=`isoinfo -d -i $device | grep "^Logical block size is:" | cut -d " " -f 5`
if test "$blocksize" = ""; then
echo catdevice FATAL ERROR: Blank blocksize >&2
exit
fi

blockcount=`isoinfo -d -i $device | grep "^Volume size is:" | cut -d " " -f 4`
if test "$blockcount" = ""; then
echo catdevice FATAL ERROR: Blank blockcount >&2
exit
fi

command="dd if=$device bs=$blocksize count=$blockcount conv=notrunc,noerror"
echo "$command" >&2
$command

 

./rawread /dev/cdrom | md5sum

 

without mounting it, but with the CD in the drive. Assuming, of course, that /dev/cdrom is your CD ROM drive.

This md5sum should match the ISO.

 

I disagree with the 4x burn speed, but we could debate that all day. :D

I have burned all my data CDs at max speed and created not one coaster. Now, music CDs, I won't burn at higher than 4x, due to loss of quality.

Edited by Steve Scrimpshire
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I used to buy cheap disks be it CD or DVD. Expect coasters with cheap media. I now by TDK, never had a coaster since. And I burn at the default speed that K3B picks up which is normally the max of my drive 24x or higher for CD and 8x for DVD.

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