Hard disk media players and memory stick

Hi

Can anyone inform me if one can use a usb memory stick to transfer files to portable hardisk media players such as:

OTG USB Hard Disk Enclosure Media Player

Aqua Multimedia Player


These devices connect to pc's via usb but not sure if they take usb stick input - which would be a very convenient way of transfer files from a PC to the media player and onto the harddrive.

Thanks