Harvey Norman (or Hardly Normal to some) had a sale on these Visione DVD players yesterday for $9 each .. cheaper than a big mac meal

I have sussed out the USB drive limitations, from what I understand the USB port only reads FAT32 type disks, and to top it all, the FAT32 spec used is based on the Windows 2000 FAT 32 specification, and if you look this up on the microsoft website, it says that Windows 2000 can only read a maximum of 32 GB using FAT32.
So there you have it, all is explained, go buy yourself a Flash drive up to 32 GB, or partition a small part of your portable hard drive to a 32gb FAT32 partition, or maybe make it a 31.5gb partition to be safe.
Dew Yodor