FYI, always handle your CF cards carefully. For example, it's a good idea to be sure the MT power is off before removing the card. Also, when you plug the MT into your computer (or if you plug the CF card directly into a CF reader), there is a green arrow icon in Windows system tray called, "Safely Remove hardware." It's a good idea to use this before removing your CF card or unplugging the MT.
SD cards seem to be pretty indestructible, but CF cards seem a lot more sensitive, and you can ruin a CF card if you're not careful. Another poster also mentioned reformatting the card before each new use - seems like a good idea to me and it's now part of my routine.
So far I've trashed two CF cards through carelessness/ignorance, and even worse lost 3 excellent recordings. Learn from my pain <grin>