Try this 1.
Click on Start --> Run ---> type diskmgmt.msc and click on OK.
Right-click on wd passport Drive --> Select "Change Drive Letter and Paths..." --->
Click on "Add" button ---> Select your drive letter and click on OK.
Note : If the drive letter is already assigned, then try changing the drive letter
by clicking on "Change" button instead of "Add" button in the above step.
If the problem still exists then
Click on Start --> Run --> type regedt32 and click on OK.
Registry Editor will be opened.
First backup your registry by going to File --> Export.
At the left side navigate to this location
If you see any upperfilter or lowerfilters at the right side delete it.