[Raion]

You cannot clone both disks into a single drive. HOWEVER, you can clone your boot drive, then edit /etc/fstab on the new drive to remove references to your second disk, create the directories on the new disk, and then copy over the data off the second one using something like rsync or just straight up CP - I prefer rsync usually but that's just a personal choice, for something like this it doesn't matter /too/ much.