Strange corruption of CD-ROM I/O

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#132

From: Ben Peddell
Date: Sat, 02 Aug 2003 11:18

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I have a 3-year old 36x CD-ROM drive, and it seems to be failing.
It has trouble reading CDRs that it could read a month or so ago (and 
that other computers can still read).

Last night, it was fairly cold (about 10C), and it had strange 
corruption of disks that I knew were perfectly OK. In Cooked mode, it 
kept getting read errors. In RAW mode, it got no errors, but it seemed 
to be reading 156 bytes too soon, and xor-ing with a certain pattern.
This made sector 0 of the BIN file to start with the 156 bytes from the 
end of sector -1, and thus Daemon-Tools Stealth-DVD complained that 
there were no sync bytes.
Audio was read fine though (from the same CD).

I was able to recover the data from the CD-ROM image (by seeking 156 
bytes and XORing each sector with the pattern based on the first (empty) 
sector.

The XOR pattern was constant along the entire Data portion of the image. 
It was even repeated in another image that was partly read.

I'm wondering if anyone can speculate, or has any thoughts on this.
If someone wants, I could make the XOR pattern available for others.

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From: Ben Peddell <killer.lightspeed@bigpond.com>
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