I'm backing up a game I purchased recently and I am having some issues. I am currently using good ole dd in the following way...

dd if=/dev/cd0a of=filename.iso bs=2k

I've used this on other CDs without issue. But on this game CD I get the following...

bash-2.05b# dd if=/dev/cd0a of=Comanche4.iso bs=2k ; ls -la
dd: /dev/cd0a: Input/output error
821+0 records in
821+0 records out
1681408 bytes transferred in 2.174 secs (773416 bytes/sec)

dd transfers 1.6 megabytes before dying. It should have 686,510,080 bytes (according to my Windows box). I found some information on the net that suggests that multi-session CD's may not work with this method, but there was no information about how to make it work.

Any ideas?

Brian