Jump to content

Question about ISO files


AMJF

Recommended Posts

If I create an ISO file for a DVD, burn the ISO file to said DVD and then lose the ISO file, will I get exactly the same ISO file contents back if I create it from the burnt DVD? Or is there a difference in content?

 

Link to comment
Share on other sites

Sometimes drives will round up the number of sectors they burn to the nearest 16.

 

So if you read a disc with 14 sectors, you'll get an image with 14 sectors. Burn that 14 sector image to a disc and you may end up with a disc that appears to have 16 sectors and then when you read it back, you'll end up with an image with 16 sectors.

Link to comment
Share on other sites

Would explain a few things, like why there's a "size" and a "size on disk" for file size reports in Windows, eh?

 

Well, it's no effort to burn the disc and then recreate the ISO from the disc, it just takes time.

 

Thanks for the info, anyway ;)

Link to comment
Share on other sites

  • 4 months later...

It's been a while since I posted here, but I want to ask:

 

So sometimes if I do the above, there will be a difference in size, but basically, will all the data be the same, identical, on both ISO image and disc? And is it trailing zeroes that make up the difference? If so, that's not so bad and I can live with NOT recreating the ISO from the freshly-burned disc, but simply verifying the disc instead.

 

So will it be the same?

Link to comment
Share on other sites

×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.