I think that the majority of TVs support only FAT32 and NTFS formatted storage devices.
In order for your WD external hard drive to be recognized, I believe you should re-format it again and see if that will get your TV to detect it.
Here's link to our knowledge base that explains how to perform this: http/products.wdc.com/support/kb.ashx?id=R4EsiO
I think that the majority of TVs support only FAT32 and NTFS formatted storage devices.
In order for your WD external hard drive to be recognized, I believe you should re-format it again and see if that will get your TV to detect it.
Here's link to our knowledge base that explains how to perform this: http/products.wdc.com/support/kb.ashx?id=R4EsiO