The USB port will accept an 8 gig stick. However, the mandatory FAT or FAT32 format limits video size to 2 gigabytes (FAT) or 4 GB (FAT32).
BUT if you use any other format, file size goes up and can easily exceed 2 gigabytes (if you are using FAT). Also NTFS is NOT supported at all (most common file system with windows computers).
This unit allows users to play files stored on both USB and SD cards including MP3 music, MP4 short
video clips and JPEG photo files.The USB port will also charge many devices like iPods and MP3 players (but not iPad).
SD Card slot
Reads media stored on SD cards. The GT-3.0 supports SD cards with up to 8GB capacity. The SD card must be formatted to be FAT or FAT32.
The USB port will also charge many devices like iPods, MP3 players and cameras. Plus, allows users to play files stored on USB and USB attached media devices, including music, video and photo files.The GT-3.0 supports USB flash drives with up to 8GB capacity. The USB drive must be formatted to be FAT or FAT32.
FAT32 Systems and 2GB File Size Limit
A caveat. There is a note in the manual regarding long files:
Because of variations in 3rd party recording methods some discs, USB devices or SD cards may not play on this unit. Also, the SD and USB ports are capable of playing short video clips. Long playing video files may experience buffering delays and video freeze if viewing is attempted through these ports.
Short Range Wireless is not video enabled and will not play video files.