Canon HD Camcorder > iMac > My Passport > WD TV Live Plus

All brand new products that I purchased in order to store and view HD home videos. Currently, the passport is setup to backup my iMac. I would like to be able to keep those backup files on the passport, but also store HD video on there in order to plug into the WD TV and watch on the big screen in HD.

The backup files are not readable/playable via the WD TV device. Am I able to create a file on the passport to keep “active” files (HD video, photos, music) in order to use through the WD TV box?