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Re: DiscImageCreator
Posted: Mon Jul 17, 2017 8:06 am
by sarami
Only 3 sector? but clearly, 289 sectors are error if use 0xd8..
Track 3 is recognized as Audio mode in IsoBuster."
I guess the shift is caused by data > audio transition?
I don't know, but these sectors are clearly including the data sector. "00 ff ... ff 00" is sync, "69 b6 10" is the scrambled msf, "61" is the scrambled mode.
Re: DiscImageCreator
Posted: Tue Jul 18, 2017 10:29 am
by sarami
F1ReB4LL wrote:https://redump.info/disc/16920/ -- scrambled contents has the pre-last sector half-scrambled, half-descrambled and the last sector descrambled, so the descrambled dump should have the last sector scrambled and the pre-last sector inverted. It's a common Saturn mastering error. For some reason DIC leaves the last sector as is without scrambling it, that's not correct. And the earlier DIC versions work fine, I remember I've tested such discs, dumps were correct.
20170719 test
- changed: Directory record size from 8192 to 16384 (for some amiga CD)
- fixed: data sector is descrambled when sync and mode is valid and reverted sector
xTMODx wrote:sarami wrote:Is it really ISO9660 disc? If so, it is easily unbelievable that "Only" old Windows (3.1?, 95?, 98?, 2000? etc) can read it.
here are the dump files with reentrant's DIC
http://www107.zippyshare.com/v/xb6AmTRp/file.html i could open the disc on windows xp but not on windows 8.1 tested on 4 plextor drives
_volDesc.txt
Code: Select all
========== LBA[000016, 0x00010]: Volume Descriptor ==========
Volume Descriptor Type: 1
Standard Identifier: CD001
Volume Descriptor Version: 1
System Identifier:
Volume Identifier: MASTERQUIZ
Volume Space Size: 510448
Volume Set Size: 1
Volume Sequence Number: 1
Logical Block Size: 1024
Path Table Size: 116
Location of Occurrence of Path Table: 36
Location of Optional Occurrence of Path Table: 0
Length of Directory Record: 34
Extended Attribute Record Length: 0
Location of Extent: 40
:
Correct size of "Volume Space Size" is perhaps 255384. "Location of Occurrence of Path Table" is perhaps 18. "Location of Extent" is perhaps 20. Other values may be corrupt.
If possible, I don't want to skip reading the path and directory table. These values are to fix manually in app. Of course, the image file isn't fixed.
Re: DiscImageCreator
Posted: Tue Jul 18, 2017 4:16 pm
by xTMODx
i have exact the same disc twice i can send you as a donation if that can help
Re: DiscImageCreator
Posted: Tue Jul 18, 2017 4:20 pm
by reentrant
In this case it's possible to reimage from mounted image in virtual drive
Re: DiscImageCreator
Posted: Thu Jul 20, 2017 12:45 pm
by sarami
Updated test version.
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I had thought that "Logical Block Size" is fixed in 2048 byte. But Ecma-119 says below.
6.2.2 Logical Block
The Volume Space shall be organized into Logical Blocks. Each Logical Block shall consist of 2n+9 bytes,
where n equals 0 or a positive integer. The number of bytes in a Logical Block shall be referred to as the Logical
Block size which shall not be greater than the Logical Sector size.
That is, it is correct that "Logical Block Size" is 1024 byte and "Volume Space Size", "Location of Occurrence of Path Table" and "Location of Extent" is double size because "Logical Block Size" is half size.
https://redump.info/disc/43476/
File system doesn't corrupt, but CD-ROM that "Logical Block Size" isn't 2048 byte is perhaps rare or irregular. So, I think the OS that is newer than WinXP doesn't support it.
Re: DiscImageCreator
Posted: Thu Jul 20, 2017 7:50 pm
by F1ReB4LL
Gap detection glitch (last track).
Re: DiscImageCreator
Posted: Fri Jul 21, 2017 12:36 am
by reentrant
sarami wrote:https://redump.info/disc/43476/
File system doesn't corrupt, but CD-ROM that "Logical Block Size" isn't 2048 byte is perhaps rare or irregular. So, I think the OS that is newer than WinXP doesn't support it.
Nice find. Also some tools do not support it either (Total Commander) + 7z.
Re: DiscImageCreator
Posted: Fri Jul 21, 2017 11:24 am
by sarami
F1ReB4LL wrote:Gap detection glitch (last track).
_disc.txt
Code: Select all
========== TOC ==========
:
Audio Track 50, LBA 247692- 250338, Length 2647
Audio Track 51, LBA 250339- 255212, Length 4874
Total 255213
Code: Select all
========== FULL TOC ==========
Session 1, Track 50, MSF 55:04:42 (LBA[247842, 0x3c822])
Session 1, Track 51, MSF 55:00:00 (LBA[247500, 0x3c6cc])
LBA of TOC is correct but LBA of FULL TOC is incorrect. I don't know why...
Re: DiscImageCreator
Posted: Fri Jul 21, 2017 3:49 pm
by F1ReB4LL
sarami wrote:LBA of TOC is correct but LBA of FULL TOC is incorrect. I don't know why...
Another one:
Re: DiscImageCreator
Posted: Sat Jul 22, 2017 10:14 am
by sarami
Updated.
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I suspect PX-716, but the LBA of "FULL TOC" and "TOC" is same if it is single session disc, so the LBA of "FULL TOC" is only used in multi session disc.