You can mount the USB permanently on the AMP using the following steps.
# vi /etc/fstab // Open fstab with vi editor, and the syntax should be self evident:
/path to USB device /path to mount point fstype options 0(in most cases) 0(in most cases)
Fstype option is to specify the file system
EX: If you wanted to mount a usb flash drive at boot up, taking up device /dev/sda1 at /mnt/usb with a FAT file system, the line would be:
/dev/sda1 /mnt/usb vfat defaults 0 0
Save the file and after that the USB will be mounted automatically whenever AMP boots up.