Configured my DCS-5020L to send motion-activated video to a 32gb USB flash drive attached to my router, after setting the drive up as an FTP site.  Works fine, but I now have numerous 10-15 second .avi files to go through to review one night of activity.  Why a 15 second max limit on video, and the max limit on file size?  Just wondering why I cannot choose to limit each video file to an hour, for example, if I know I have the storage capacity to handle it.