Cl6 SD Memory Card on 7Mb/s Camera?

Yes, the Transcend Cl 6 will work great with your Casio. I checked the specifications for the Casio Exilim EX-Z77 and the largest video resolution is 848 x 480 pixels, which is smaller than high definition sizes (1280 x 720 or 1920 x 1080). You should have no trouble at all with the Transcend card.