Amazon.com : Canon VIXIA HF S21 Full HD Camcorder w/64GB Flash Memory & Pro Manual Control (Discontinued by Manufacturer) : Sony Camcorder : Electronics
Canon Knowledge Base - Selecting the USB connection mode with the VIXIA HF S20, HF S200, and HF S21
Amazon.com : Canon VIXIA HF S21 Full HD Camcorder w/64GB Flash Memory & Pro Manual Control (Discontinued by Manufacturer) : Sony Camcorder : Electronics