I’m still not sure what corrupted my CF cards. I did a simple test this morning. I set the quality to RAW+L which produced about 10MB of data for every photo.
I quickly filled the CF card without incident.
Afterwards I removed and replaced the lens in case that caused the corruption but it still worked fine. I don’t know. 🙁
Anyway, here’s a list of Canon EOS 20D and compact flash card timings. I have Viking CF cards. Third from the bottom! Boohoo! I need faster media!