Canon HG21 is a successor of HG10 as it was built around similar functionality with additional output mode, extra storage and some more. It comes with 120 GB storage. It still carries the same five recording mode as HG10, from the sharpest resolution with MXP at 1920 x 1080 (equivalent to 24 Mbps), down to 5 Mbps for lower but significantly takes less storage. For your information, 120 Gb can hold up to 45 hours of long recording with comparable quality of image to competitors. It is very good for semi-pro who goes to field trip without the need to constantly back up the videos.