Hi! Could you possibly advise me why my laptop (Dell Inspiron 3521 service tag: 9BYMGW1) doesn't detect my new harddrive: Seagate 7mm SSHD, ST500LM000, SATA III. Is it because it is thinner than the original harddrive: Samsung 9.5mm HHD, ST750LM022, SATA II? Many thanks for your reply.