Yes, USB3.0 memory sticks that are backwards compatible with USB 2.0/1.1 and will work with GLD-80. 

Supported file systems are FAT12, FAT16 and FAT32.

Size limits are as follows:

FAT12 = 255MB
FAT16 = 2GB
FAT32 = 2TB

Note: external disks formatted as NTFS will not show up on the system.