I have a USB drive formatted to NTFS so that it could accommodate a 4.6GB MKV file. ’
For some reason, the WDTV won’t run the MKV file on the USB. It says it’s an unsupported format. Meanwhile, the same exact MKV file can run from WiFi. (The problem is, I can’t run the entire file because of choppiness, so I must put it on a USB drive.).
There are many that are reported to work but also a number that apparently don’t. Check it out and, if possible, create a reply in that thread mentioning that your HP drive doesn’t so that others may benefit. ;)