Option try a usb chip drive format it as ntfs copy a m4v file to it and then see if your HTS plays ok..
get the HP usb format tool to to do the format operation.(google to find it)
If you use a USB extension cable or USB HUB, the USB device may not
be recognized
File extensions: “.jpg”, “.jpeg”, “.png”, “.avi”, “.divx”, “.mpg”, “.mpeg”,
“.mkv”, “.mp4”, “.mp3”, “.wma”, “.pcm” (LPCM)
you could try changing the extension to mp4 on a file to see if it will run ,as m4v is same file format
This player supports USB flash memory/external HDD formatted in
FAT16, FAT32 and NTFS when accessing files (music, photo, movie).
However, for BD-Live, only FAT16 and FAT32 formats are supported.
Please use the Internal Flash Memory or USB flash memory/external
HDD formatted in either FAT16 or FAT32 when using BD-Live.
• The USB device can be used for the local storage for enjoying BD-Live