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I get this when trying to read a psx game. I just bought Xenogears online and there is a scratch on the second disk, so I wanted to try making a copy of it to be sure it is readible.
However...
localhost standalone # dd if=/dev/cdrom of=xenodisk1.iso bs=2k
dd: reading `/dev/cdrom': Input/output error
0+0 records in
0+0 records out
Neither disk works, but other cd's copy fine. The disk does contain data, though.
localhost standalone # mount /dev/cdrom /mnt/cdrom/
mount: block device /dev/cdrom is write-protected, mounting read-only
localhost standalone # ls -l /mnt/cdrom/
total 297
-r-xr-xr-x 1 root root 303104 Aug 27 1998 slus_006.64
-r-xr-xr-x 1 root root 67 Aug 27 1998 system.cnf
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