Linux Mint Forums

I guess you've ended up in UUID hell
http://www.linuxmint.com/wiki/index.php ... _a_problem
So change your present disk to sda and add/change the new to sdb and I think you're good to go
Sorry for this

The solution is found in the UUID wiki if your disks are found in fstab
If the new disks are not in fstab check the forum for mounting disks or post back