A:Answer Hi,
The TV does not support a Hard Drive.
You can watch a video from a USB Flash Drive using the app VLC for Fire.
The app VLC for Fire supports the following formats:
MKV, MP4, AVI, MOV, Ogg, FLAC, TS, M2TS, Wv and AAC
The TV supports one USB flash drive up to 128 GB formatted FAT32
Alan O. - Insignia Support