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Re: DiscImageCreator

Posted: Wed Aug 28, 2019 8:57 am
by Jackal
sarami wrote:Siedler III, Die - Das Geheimnis der Amazonen (Germany)

Code: Select all

========== LBA[339222, 0x52d16]: Main Channel ==========
       +0 +1 +2 +3 +4 +5 +6 +7  +8 +9 +A +B +C +D +E +F
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0810 : FF 00 FF 00 FF 00 FF 00  FF 00 FF 00 FF 00 FF 00   ................
0820 : FF 00 FF 00 FF 00 FF 00  FF 00 FF 00 FF 00 FF 00   ................
0830 : FF 00 FF 00 FF 00 FF 00  FF 00 FF 00 FF 00 FF 00   ................
0840 : FF 00 FF 00 FF 00 FF 00  FF 00 FF 00 FF 00 FF 00   ................
0850 : FF 00 FF 00 FF 00 FF 00  FF 00 FF 00 FF 00 FF 00   ................
0860 : FF 00 FF 00 FF 00 FF 00  FF 00 FF 00 FF 00 FF 00   ................
0870 : FF 00 FF 00 FF 00 FF 00  FF 00 FF 00 FF 00 FF 00   ................
0880 : FF 00 FF 00 FF 00 FF 00  FF 00 FF 00 FF 00 FF 00   ................
0890 : FF 00 FF 00 FF 00 FF 00  FF 00 FF 00 FF 00 FF 00   ................
08A0 : FF 00 FF 00 FF 00 FF 00  FF 00 FF 00 FF 00 FF 00   ................
08B0 : FF 00 FF 00 FF 00 FF 00  FF 00 FF 00 FF 00 FF 00   ................
08C0 : FF 00 FF 00 FF 00 FF 00  FF 00 FF 00 FF 00 FF 00   ................
08D0 : FF 00 FF 00 FF 00 FF 00  FF 00 FF 00 FF 00 FF 00   ................
08E0 : FF 00 FF 00 FF 00 FF 00  FF 00 FF 00 FF 00 FF 00   ................
08F0 : FF 00 FF 00 FF 00 FF 00  FF 00 FF 00 FF 00 FF 00   ................
0900 : FF 00 FF 00 FF 00 FF 00  FF 00 FF 00 FF 00 FF 00   ................
0910 : FF 00 FF 00 FF 00 FF 00  FF 00 FF 00 FF 00 FF 00   ................
0920 : FF 00 FF 00 FF 00 FF 00  FF 00 FF 00 FF 00 FF 00   ................
Is that scrambled or unscrambled?

It looks like it should be kept in that format

Re: DiscImageCreator

Posted: Wed Aug 28, 2019 9:25 am
by iR0b0t
Main channel data should not be fixed at all, also if you are overwritting the user data with 0x55 due to protection.

Did i read it right, sarami, are you fixing invalid sync/msf/mode?
It should not be a thing.

Re: DiscImageCreator

Posted: Wed Aug 28, 2019 9:45 am
by Jackal
iR0b0t wrote:Main channel data should not be fixed at all, also if you are overwritting the user data with 0x55 due to protection.

Did i read it right, sarami, are you fixing invalid sync/msf/mode?
It should not be a thing.
It was fixed before, for protection-related sectors that were replaced with 0x55. But we are stepping away from that now.

Re: DiscImageCreator

Posted: Wed Aug 28, 2019 9:49 am
by iR0b0t
Should have never been a thing, i missed that.

Re: DiscImageCreator

Posted: Wed Aug 28, 2019 10:40 am
by sarami
Jackal wrote:Is that scrambled or unscrambled?
scrambled.

Uploaded: http://www.mediafire.com/file/eq80y20l9 … st.7z/file

Re: DiscImageCreator

Posted: Wed Aug 28, 2019 12:15 pm
by Jackal
sarami wrote:
Jackal wrote:Is that scrambled or unscrambled?
scrambled.
Can you tell us how the descrambling works again? I mean, for mastering errors, what are the criteria to descramble?

I guess we should use the same criteria for these sectors.

Re: DiscImageCreator

Posted: Wed Aug 28, 2019 2:25 pm
by reentrant
Descramble algorithm is the most critical aspect and it'd be very troublesome if it had to be changed once again...

Another idea:
Why to replace sector with C2 errors with 0x55 when you could just replace specific bytes with some pattern and leave the good data as is?

Another question:
What if there's a sector with few bits set to 1 in C2 and it's easily correctable by ECC? Should it be replaced with 0x55, fixed or left as is?

Re: DiscImageCreator

Posted: Wed Aug 28, 2019 4:03 pm
by Jackal
reentrant wrote:Descramble algorithm is the most critical aspect and it'd be very troublesome if it had to be changed once again...

Another idea:
Why to replace sector with C2 errors with 0x55 when you could just replace specific bytes with some pattern and leave the good data as is?

Another question:
What if there's a sector with few bits set to 1 in C2 and it's easily correctable by ECC? Should it be replaced with 0x55, fixed or left as is?
A protection is detected with a particular range. The C2 errors within that range are the trigger for replacing sectors with 0x55. There is no good data there.

Re: DiscImageCreator

Posted: Wed Aug 28, 2019 9:01 pm
by sarami
Jackal wrote:Can you tell us how the descrambling works again? I mean, for mastering errors, what are the criteria to descramble?
1. Sector needs to be the data [Ctrl byte of subQ is 4 or 6]
2. Sync needs to be valid [00 FF FF FF FF FF FF FF FF FF FF 00]
3-1. If mode is 0x60, 2336 bytes need to be zero.
3-2. If mode is 0x61 and reserved area (from 0x814 to 0x81b) is reversed (all zero), it's descrambled.
3-3. If mode is reversed (0x00 or 0x01 or 0x02), it's descrambled.
3-4. If mode is unknown and msf is reversed and reserved area isn't all zero, it's not descrambled.
3-5. If mode is unknown and msf isn't reversed and reserved area is all zero, it's descrambled.
3-6. If mode is unknown and msf isn't reversed and reserved area is invalid, it's not descrambled.

Re: DiscImageCreator

Posted: Wed Aug 28, 2019 9:48 pm
by RibShark
sarami wrote:My drive is BC-12D2HT (FW:3.11). Do you know how to downglade the FW?
Use a custom flasher (info can be found on the MakeMKV forums) to flash the BC-12D2HT MK firmware (also found on the MakeMKV forums, custom firmware pack). That will enable firmware downgrading. Afterwards, flash the older firmware (crossflashing to the BW-16D1HT 3.02 DE firmware should work fine). Let me know if you have trouble finding anything.