Will read small sd card on usb, not my larger external hard drives. Anything I can do to alleviate this situation?
Hard Drives over 2TB use GPT (GUID Partition Table)
Apparently, support for GPT was resolved with a Firmware Update.
Also, make sure your Hard Drive is formatted either NTFS, FAT32 or HFS
WDTV Media Players are not compatible with exFAT.