You can't use SDCARD for CTK810 model.
Please connect to a computer using a USB cable. Then you can use a commercial MIDI file player to play to your keyboard.
Alternatively, you can download SMF Converter from
http://music.casio.com/e/smf/
This program will convert SMF (.mid files) into a format readable by your Casio keyboard and then load it directly into your keyboard.
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