Is it possible for a Content Hash Table to be corrupt?

[Radiocomms237]

As the title says, is it possible for a Content Hash Table to be corrupt?

I'm ripping the Jack Irish TV Series and all was going well until I reached S3D1...

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Using LibreDrive mode (v01.0 id=FCF253697C55)
Backing up disc into folder "P:/TV Shows - In Progress/Jack Irish franchise/FULL DISC BACKUP(S)/JACK_IRISH_SEASON_3_DISC_1"
Downloading latest HK to P:/VideoPad Cache ...
Loaded content hash table, will verify integrity of M2TS files.
Hash check failed for file 00004.m2ts at offset 190464, file is corrupt.
Hash check failed for file 00004.m2ts at offset 387072, file is corrupt.
Hash check for /BDMV/STREAM/00004.m2ts : 86.48% corrupt, 0% correct, 86.48% checked.
Hash check failed for file 00009.m2ts at offset 190464, file is corrupt.
Hash check failed for file 00009.m2ts at offset 387072, file is corrupt.
Hash check failed for file 00009.m2ts at offset 583680, file is corrupt.
Hash check failed for file 00009.m2ts at offset 780288, file is corrupt.
Hash check failed for file 00009.m2ts at offset 976896, file is corrupt.
Too many hash check errors in file 00009.m2ts.
Hash check for /BDMV/STREAM/00009.m2ts : 97.32% corrupt, 0% correct, 97.32% checked.
Hash check failed for file 00008.m2ts at offset 190464, file is corrupt.
Hash check failed for file 00008.m2ts at offset 387072, file is corrupt.
Hash check failed for file 00008.m2ts at offset 583680, file is corrupt.
Hash check failed for file 00008.m2ts at offset 780288, file is corrupt.
Hash check failed for file 00008.m2ts at offset 976896, file is corrupt.
Too many hash check errors in file 00008.m2ts.
Hash check for /BDMV/STREAM/00008.m2ts : 99.49% corrupt, 0% correct, 99.49% checked.
Hash check failed for file 00022.m2ts at offset 190464, file is corrupt.
Hash check failed for file 00022.m2ts at offset 387072, file is corrupt.
Hash check failed for file 00022.m2ts at offset 583680, file is corrupt.
Hash check failed for file 00022.m2ts at offset 780288, file is corrupt.
Hash check failed for file 00022.m2ts at offset 976896, file is corrupt.
Too many hash check errors in file 00022.m2ts.
Hash check for /BDMV/STREAM/00022.m2ts : 99.87% corrupt, 0% correct, 99.87% checked.
Hash check failed for file 00021.m2ts at offset 190464, file is corrupt.
Hash check failed for file 00021.m2ts at offset 387072, file is corrupt.
Hash check failed for file 00021.m2ts at offset 583680, file is corrupt.
Hash check failed for file 00021.m2ts at offset 780288, file is corrupt.
Hash check failed for file 00021.m2ts at offset 976896, file is corrupt.
Too many hash check errors in file 00021.m2ts.
Hash check for /BDMV/STREAM/00021.m2ts : 99.94% corrupt, 0% correct, 99.94% checked.
Hash check failed for file 00020.m2ts at offset 190464, file is corrupt.
Hash check failed for file 00020.m2ts at offset 387072, file is corrupt.
Hash check failed for file 00020.m2ts at offset 583680, file is corrupt.
Hash check failed for file 00020.m2ts at offset 780288, file is corrupt.
Hash check failed for file 00020.m2ts at offset 976896, file is corrupt.
Too many hash check errors in file 00020.m2ts.
Hash check for /BDMV/STREAM/00020.m2ts : 99.94% corrupt, 0% correct, 99.94% checked.
Hash check failed for file 00001.m2ts at offset 190464, file is corrupt.
Hash check failed for file 00001.m2ts at offset 387072, file is corrupt.
Hash check failed for file 00001.m2ts at offset 583680, file is corrupt.
Hash check failed for file 00001.m2ts at offset 780288, file is corrupt.
Hash check failed for file 00001.m2ts at offset 976896, file is corrupt.
Too many hash check errors in file 00001.m2ts.
Hash check for /BDMV/STREAM/00001.m2ts : 95.63% corrupt, 0% correct, 95.63% checked.
Hash check failed for file 00006.m2ts at offset 190464, file is corrupt.
Hash check failed for file 00006.m2ts at offset 387072, file is corrupt.
Hash check failed for file 00006.m2ts at offset 583680, file is corrupt.
Hash check failed for file 00006.m2ts at offset 780288, file is corrupt.
Hash check failed for file 00006.m2ts at offset 976896, file is corrupt.
Too many hash check errors in file 00006.m2ts.
Hash check for /BDMV/STREAM/00006.m2ts : 96.70% corrupt, 0% correct, 96.70% checked.
Hash check failed for file 00010.m2ts at offset 190464, file is corrupt.
Hash check failed for file 00010.m2ts at offset 387072, file is corrupt.
Hash check failed for file 00010.m2ts at offset 583680, file is corrupt.
Hash check failed for file 00010.m2ts at offset 780288, file is corrupt.
Hash check failed for file 00010.m2ts at offset 976896, file is corrupt.
Too many hash check errors in file 00010.m2ts.
Hash check for /BDMV/STREAM/00010.m2ts : 96.70% corrupt, 0% correct, 96.70% checked.
Hash check failed for file 00005.m2ts at offset 190464, file is corrupt.
Hash check failed for file 00005.m2ts at offset 387072, file is corrupt.
Hash check failed for file 00005.m2ts at offset 583680, file is corrupt.
Hash check failed for file 00005.m2ts at offset 780288, file is corrupt.
Hash check failed for file 00005.m2ts at offset 976896, file is corrupt.
Too many hash check errors in file 00005.m2ts.
Hash check for /BDMV/STREAM/00005.m2ts : 99.99% corrupt, 0% correct, 99.99% checked.
Hash check failed for file 00002.m2ts at offset 190464, file is corrupt.
Hash check failed for file 00002.m2ts at offset 387072, file is corrupt.
Hash check failed for file 00002.m2ts at offset 583680, file is corrupt.
Hash check failed for file 00002.m2ts at offset 780288, file is corrupt.
Hash check failed for file 00002.m2ts at offset 976896, file is corrupt.
Too many hash check errors in file 00002.m2ts.
Hash check for /BDMV/STREAM/00002.m2ts : 99.99% corrupt, 0% correct, 99.99% checked.
Hash check failed for file 00011.m2ts at offset 190464, file is corrupt.
Hash check failed for file 00011.m2ts at offset 387072, file is corrupt.
Hash check failed for file 00011.m2ts at offset 583680, file is corrupt.
Hash check failed for file 00011.m2ts at offset 780288, file is corrupt.
Hash check failed for file 00011.m2ts at offset 976896, file is corrupt.
Too many hash check errors in file 00011.m2ts.
Hash check for /BDMV/STREAM/00011.m2ts : 99.99% corrupt, 0% correct, 99.99% checked.
Encountered 179576 errors of type 'HashCheck Error' - see http://www.makemkv.com/errors/hashcheck/...
Backup done but 12 files failed hash check

What does "Downloading latest HK" mean, I don't think I've ever seen that before, but it seems to have screwed everything up?

[dcoke22]

What does "Downloading latest HK" mean, I don't think I've ever seen that before, but it seems to have screwed everything up?

4K UHDs are decrypted using a set of downloaded 'hashed keys'. MakeMKV checks for an updated list of keys and downloads them in the background automatically.

Fixing Volume Key is Unknown

That process is unrelated to your disc's hash check errors. Try gently cleaning the disc.

[Radiocomms237]

Thanks. Yes, I tried "gently" cleaning the disc and it made no difference, I guess I'll try not-so-gently cleaning it with some white vinegar and see if anything changes.

It's just that I've ripped thousands of discs and I've never seen one before with hash errors in EVERY SINGLE FILE!

[dcoke22]

i prefer liquid dish soap and plenty of water for cleaning discs. If there's a film or oil on the disc, the dish soap seems to do a good job removing it. I dry the data side of the disc with a can of air.

It is certainly possible there's a problem with that disc's content hash table. Users occasionally report discs with mastering errors on this forum. But looking at the entry on blu-ray.com (https://www.blu-ray.com/movies/Jack-Iri ... ay/299094/) I don't see a forum discussion about a bad batch of discs. I also didn't notice a bunch of complaints about bad discs in a quick scan of the Amazon.com comments.

[Radiocomms237]

Looking in the (decrypted) backed-up folder, under MAKEMKV/AACS/, there are two distinct content hash tables ("ContentHash000.tbl" & "ContentHash001.tbl") and I've CRC'd both of them with their counterparts in the MAKEMKV/AACS/DUPLICATE/ folder and both are identical, respectively.

So I doubt the hash table is actually corrupt, unless, as you say, it's a mastering problem. I wonder why there are two very different hash tables (one is a fair bit bigger than the other)?

I suppose it's just a damaged disc?

Thanks again!

[dcoke22]

On blu-rays, the content hash tables are per layer. Your disc in question must've been a dual layer disc.

https://aacsla.com/wp-content/uploads/2 ... ed.921.pdf

See section 2.3.1 on page 8.

[Krawk]

CSI: Season 1 has corrupt hash tables.

[dcoke22]

CSI: Season 1 has corrupt hash tables.

Out of curiosity, how do you know?