Hello,
When you connect the drive to your new router you will need to map it on the new computer.
Check page #10 of the user’s manual and review the installation steps.
http://www.wdc.com/wdproducts/library/UM/ENG/4779-705065.pdf
To get the WD Smartware software installed click on the link below:
This also might help:
Mapping a Personal Cloud drive or WD NAS drive on a Windows PC