There has been quite a lot of discussion on this forum concerning card issues. To save you looking back through them, here are the main conclusions:
1) Do NOT format large cards (>256M) on Eclipse.
2) Do NOT use FAT32 – use FAT format only. A blank card usually comes in FAT format.
3) Do NOT use cards bigger than 2GB.
If you follow the above, and use name brand cards (Sandisk recommended) you should have no problems.