How to Preserve DVD ISO File Hash or edit ISO Metadata?

[timespeed]

What software can I use to preserve the same DVD ISO file hash even after burning it to a disc so I don't have to keep it on my HDD?

In UltraISO I tried opening a DVD ISO file and saving it as a new one but got a different ISO file hash compared to the original ISO (all files inside both ISOs have identical file hashes). I also compared both ISO files in IsoBuster and it shows DVD > Session 1 > Track 01 > "ISO" and "UDF" are the same for both ISOs but under "IFO" (also listed under Track 01) has less files in it in the new ISO.

Obviously this must affect the ISO file hash even if both ISOs play fine in VLC Player. Maybe the ISO metadata has been changed even though all visible files inside are identical (in file hash and creation date). If the ISO hash is already different now, obviously it will be different when burned to a disc.

So how can I edit the ISO metadata or structure so they both match? Or should I just create a backup of the VIDEO_TS folder instead of an ISO or will that be bad for DVD playback and preservation?

I don't know if I can burn a .ISO file itself to a disc and have it remain a .ISO file but the disadvantage would be it's unplayable in a DVD player. I would prefer it to be burned to a disc that's playable on a DVD player and still has the same file hash if I want to create a backup of it later on PC. This would ensure the original is perfectly preserved and also avoids any potential privacy issues like hardware IDs, timestamps or anything else that was not in the original, ending up in any future backups. 

Edited Monday at 01:51 AM by timespeed

[LIGHTNING UK!]

As this is the support forum for ImgBurn, you should be using ImgBurn. 
 

you should be able to write an iso to a DVD-R disc and read it back again to a new iso and the md5 should match. 
 

if you use DVD+R, you run the risk of it changing because of the Ecc block size (rounding up to 16 sectors). 

[timespeed]

ImgBurn is very good DVD burning and copying software! 🙂 But it's not a DVD ISO editor (correct me if I'm wrong!) so I was hoping someone could advise about that. I haven't been able to find much about this metadata stuff, maybe it's not well documented on the whole internet? 🤔

Interesting point you mention about DVD-R, I didn't know that! But I would prefer to use DVD+R because it's a little better at error correction.

But even if I chose DVD-R, I test ISO backups before burning. I want to figure out why UltraISO (or a similar program) changes something in the original ISO file if I open it, save it as a new ISO and yet the new ISO file hash does not match with the original (even though I didn't change anything). 😭 It would be great to manually change the ISO metadata myself so it matches so no matter what, the original is truly preserved even if I make changes, I can revert it back and it will match.

Also, I wonder if I can burn the DVD folder "VIDEO_TS" instead of using ISOs, or would that cause playback problems on DVD players?

Edited Wednesday at 09:41 AM by timespeed

[dbminter]

I don't understand the question about VIDEO_TS at the end.  It would only case playback problems on DVD players if you DIDN'T have a VIDEO_TS folder in the root directory of the disc you're attempting to play.  However, if you're asking if you need to create an ISO first for VIDEO_TS contents to get to play on a DVD player and if you can just Write contents directly to a recordable DVD in ImgBurn, I can't see why that wouldn't work.  But, if you don't want to waste a WORM disc testing that, you can attempt a test burn to a rewritable DVD disc first and test that on the player.  It would have to be a DVD-5 to test, though, unless you compressed the DVD-9 first.