ah, thanx mate....just saw this in their Help archive regarding How to Cancel an RMA:
If you have a Standard RMA:
* If you already shipped us your defective drive, we will NOT be able to return your defective drive under any circumstances. The best option is to accept the replacement drive we sent you. You will receive an email from us when the replacement drive has shipped.
* If you have not shipped us your defective drive, do not send it. You do not have to do anything. The RMA will be cancelled if we do not receive your defective drive.