Serial Number

#1

Hi,
I started using WD external hard Disk since september 2017 but never registered my product !1 Just now, twice, i keyed in the serial numbers on the bottom of a new HD box (purchased yesterday) but i kept getting “invalid serial number” !
what to do please…

#2

@Lynda88 Are you trying to enter this number for the new HD or for the old one?