DiscImageCreator

[ajshell1]

Hey Sarami. I've had a problem with some PC games with SafeDisc. Occaisonally, DIC will report an error count of 288 in a SafeDisc sector, and will attempt to reread it over and over again, never succeeding.

Let me know if you want some specific examples.

[xTMODx]

How about edccchk v1.26?

I have only edcchk 1.11 here the result

[reentrant]

I checked xTMODx's issue. The problem is because of mastering error on a disc. Few months ago the algorithm was changed from:

"Always descramble sectors of data track"

to:

"Descramble sector of data track if there's a proper sync and mode"

New DIC doesn't descramble last sector because of invalid mode.
So in this case DIC worked as expected.

[reentrant]

Another issue where DIC gives 3 errors (2 discs give the same dump), but a CloneCD dump from non-plextor drive gives 0 errors.

https://www12.zippyshare.com/v/xttyLELo/file.html

Can you check what's wrong?

Jackal I also have disc (german coverdisk) that also gives me no read errors but essentially the data returned by non PX-device is bad. I bet this is some weird mastering error that only scrambled reader can handle.

Some drives incorrectly handle such sectors in firmware and return wrong data thus masking read errors!!

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LBA[041489, 0x0a211], MSF[09:15:14], mode 1 User data vs. ecc/edc doesn't match
LBA[041490, 0x0a212], MSF[8d:a0:6c], invalid sync
LBA[041491, 0x0a213], MSF[8a:20:2e], invalid sync
LBA[041492, 0x0a214], MSF[09:15:17], mode 1

Option 2:

I have a disc that triggers some bug in Plextor firmware. Yes - Plextor firmware has bugs! The effect is the same as yours. Few sectors corrupted in the middle of the disc. I don't remember exactly which disc it was, but reripping solved the problem. Have you tried reripping your disc?

I think my disc returned some C2 errors & screwed 50-100 consecutive sectors without returning any C2 data.

Another Plextor bug: Some discs with -153 offset from 'takt' trigger a weird bug and return constant C2 data pattern 0F0F0F F0F0F0. 24 bytes in total corrupted.

[reentrant]

I'm on a spree today. Another issue: only 10 SecuROM sectors for https://redump.info/disc/55050/

Logs: https://mega.nz/#!XW5TgJIT!T8Uh9_u8xq20 … 1rIOIutUdM

I cooperated with AlMagno and he made a sub dump with CDTool, I then cleaned it with CDGTool and found misdetected SecuROM sector:

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00:01:74
01:08:50
01:14:68
01:37:49
02:04:22
02:28:25
02:49:58
02:55:71
03:21:07 !
03:26:61
03:30:54

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Found Q CRC error
-----------------
Q CRC value from the file       : 3B01
Computed Q CRC value            : F730
Offsets                         : 00 01 02 03 04 05 06 07 08 09  10 11
Q fields                        : CA TR PO RM RS RF ZE AM AS AF  CR CR
Q subcode data just before error: 41 01 01 03 19 06 00 03 21 06  05 70
Q subcode data with error       : 41 01 01 03 19 27 00 03 21 03  3B 01
Q subcode data just after error : 41 01 01 03 19 08 00 03 21 08  2B 16
Which offset to change, enter q=quit, s=skip, or an offset: 0 to 11: s

[sarami]

I have only edcchk 1.11 here the result

I understood CDmage looked invalid mode sector on error sector and edcchk didn't look it on non error sector.

"Always descramble sectors of data track"

to:

"Descramble sector of data track if there's a proper sync and mode"

No, to be exact...

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"Descramble sector of data track if there's a proper sync and mode"

to:

"Always descramble sectors of data track"

to:

"Descramble sector of data track if there's a proper sync and reserved (only mode 1)"

Q CRC value from the file       : 3B01
Computed Q CRC value            : F730

3B01 XORed with 0x8001 is BB01, not F730. So perhaps this sector also has random errors in RMSF or AMSF or CRC.
There are huge suberror in this disc, so it needs to be dumped by other good-condition disc.

I've had a problem with some PC games with SafeDisc.

Plz upload the log of latest version.

Does the c2 feature work properly?

I say yes if the drive reports c2 errors properly.

[sarami]

Another issue where DIC gives 3 errors (2 discs give the same dump), but a CloneCD dump from non-plextor drive gives 0 errors.

https://www12.zippyshare.com/v/xttyLELo/file.html

Can you check what's wrong?

mainError

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0900 : 7D A4 4D 62 45 A3 B0 63  20 29 7D 4A 9B E6 87 CC   }.MbE..c )}J....
0910 : 98 12 82 C1 B0 21 D7 BB  00 FF FF FF FF FF FF FF   .....!..........
0920 : FF FF FF 00 08 95 16 61  00 9B D5 CB A3 0A E1 A3   .......a........
LBA[041491, 0x0a213]: Track[01]: Invalid sync. Skip descrambling
========== LBA[041491, 0x0a213]: Main Channel ==========
       +0 +1 +2 +3 +4 +5 +6 +7  +8 +9 +A +B +C +D +E +F
0000 : AA 83 EC 83 12 E2 67 09  6A 0A 88 8C 8A 20 2E 86   ......g    j.... ..
0010 : 23 01 3D AF 2F 45 EF 35  73 52 F8 2F 48 0D 05 18   #.=./E.5sR./H...

Sync exists, but it's slided behind 24 bytes. Perhaps drive's cache is broken (or firmware/drive/dic bugs?). It maybe is fixed if rereading (but it's not supported yet in this case).

[AlMagno]

3B01 XORed with 0x8001 is BB01, not F730. So perhaps this sector also has random errors in RMSF or AMSF or CRC.
There are huge suberror in this disc, so it needs to be dumped by other good-condition disc.

Ok. I'll look for another new disc to go back to dump.

Thank you!

[ajshell1]

Okay sarami, here are some logs:

This disc has some additional damage to it, but I don't think that's what is causing the attempted rereads on sectors with SafeDisc. I've seen that 288 bit error thing occur in other discs, but I don't remember which discs.

[sarami]

/viewtopic.php?p=24429#p24429
"312" sectors are intentional c2 errors, but I don't know all intentional errors are 312.
At least please check rereading at 10000 times.

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discimagecreator cd f Startopia (USA) 32 /c2 10000 /d8 /sf