On Wednesday 06 April 2005 00:22, Joey Hess wrote: > peter colton wrote: > > For your reply, The reason I want to check the integrity of the cd or > > dvd after a burn. Is that I have found out that a good burn "no buffer > > under run" dose not mean that the image is OK. By checking the image with > > the md5sum -c md5sum.txt that is on the iso I am then certain that the > > product is correct. The method of dd the image off I will be looking > > into. > > The problem with the md5sum -c check is that it only checks the files > themselves and not the full filesystem. It might miss things to do with > the el torito bootable part of the CD, for example. hello joey Thanks for the pointer to using dd as the integrity check method. I have use isoinfo -d -i /dev/hdx to find out the info I need to use dd to copy just the image from the drive. Logical block size is: Volume size is: . Then with this info I set up dd . dd if=/dev/hdX bs=Logical block size count=Volume size of=sarge-i386-1.iso The when I have dd the image back to the drive I run the original md5sum file on this image again. and bingo perfect. I have all so tuned up the system with hdparm. enable 32 bit and dma on hard drives and burns. this as made a big difference for the burning speed. Before enabling 32 bit and dma. Four speed burning was turning out as two speed. now with the formentioned, four speed is four speed. All so as part of my learning curve I have seen that dvd or cd media quality plays a major part. I was using unbranded media and with very poor turn out rate of good burns. Then next a low brand RITEK and good turn burn rate. Now I am looking at using datawrite white tops median, So I am now seeing the trees from the woods more. thanks. bye for now peter colton
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