Hi, for me the easiest way to clone a drive is using clonezilla-live-cd.
The only thing, one has to pay attention to, that the target is not smaller than the source, so if you need to clone a 300GB drive, the target must be 300GB or greater. If it is greater, and you want bigger partitions, than the easiest way is, to clone from the i.e. 300GB drive to the 1,5TB drive, and then use gparted to increase and move the partitions on the 1,5TB drive to your needs. For gparted, there is also a live-cd available. (You might have noticed it: I am a big fan of livefile-systems when doing special things) Hope this helps! Best regards Hans