PCBA Number

Hi, I’ve just bought a WD3200BPVT 320G internal drive for my laptop. I am trying to register the product and I must enter the PCBA Number. I can’t find this number. What format is this number and where should I see it on the drive? Thanks, David

Hi PCBA= Printed Cirruit Board + Assembly if you look on this page it shows you where it should be.  http://www.hddzone.com/western-digital-pcb-c-2.html

Thank you so much.