Doesn't mount cd-rom

I'm trying to install Debian for the first time, and it wont mount the cd-rom. I'm putting it on a Thinkpad x60, so it doesn't have its own drive. I'm using an external cd-rom, just a CompUSA brand. It goes into the install and when it gets to the detect and mount stage it fails. I can't think of a reason for this since it's running off the cd.

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