To share, access and backup files wirelessly, simply attach an USB flash disk or USB hard disk driver (FAT16, FAT32 and NTFS file systems) to create a FTP server. No need to set up a dedicate PC running 24 hours for ftp service. The FTP server will not open the firewall. The USB-HDD should larger than 2GB. For more stable using, please use external power supply for USB-HDD. Check the list below fo