It seems you didn’t understand what I meant. Security certificates are automatically generated encrypted keys. They are being used for user authentication in the back ground in Windows NT (XP onwards) systems.
Since you have used your WD drive as a wired/wireless storage device, files that you want to access are stored with high level of security. (Public folders are open to everyone and no authentication is required)
To remedy this issue, you need to open properties of those folders from an accessible PC with admin rights and then share them with newly imaged PC’s user account.
For this you need to have Windows network admin experience. It is not an easy task to walk you through each step over this process from here.
Read file/folder sharing on network FAQ on Windows help system for more info. And this is not your external drive specific issue. In another words your drive has no problem.
Mabikay - SLK
Please Note: I am just a WD external drive user like most of us on these forums; we just try to help others as they need help from someone who has previous experiences. And I have no relationship or any other connection with Western Digital Company what so ever.