Extracted ISO is different from the Original

Jun 22, 2009 at 7:42 PM

Just for curiosity, I tested to extract and ISO from my WBFS partition to my PC to verify the ISO can be restored to the original state. 

I did a binary comparison between the two ISO images, except the size is identical, the binary level difference is big.

I understand that WBFS manager always trims out the empty space from the ISO image, when recovery, it may use different space filler to fill up. My question is, does this kind of re-fill ivolve a Trucha-Sign process, if so, if you are on a 3.4 and above firmware, than the ISO has to be Trucha-Sign patched in order to play the extracted-ISO-made DVD.