How to connect two WD 1 TB HDD simultanouely

Hello,

I had a 1 TB WD My Passport HDD before, which worked perfectly both on my PC and VAIO Laptop. Now I have bought a new _ 1 TB WD  My Passport HDD. _The problem is that when I connect each HDD seperately to PC or laptop, they work correctly. But when I conncet them together only the one connected first works, and the other is not shown in My Computer window. They are both shown under Devices and Printers in control panel. I wanted to ask how can I fix this problem so that I can transfer files from one to another.

It’s a signature collision [rblems in Windows. This explains how to fix http://community.wdc.com/t5/My-Passport-for-PC/Copy-files-from-one-drive-to-another/m-p/277504/highlight/false#M7587 see post 11.

Joe