A YouTube video showing the Coby Kyros MID1024 open:
http://www.youtube.com/watch?v=XrXCsAztMKo
The internal SD card can be seen, and it's possible to replace it with a bigger one (already tested with 6, 8 and 16GB Class 4 models).
Curiosity: it shows the version of the board as 1025_V4, and...