Okay, it was the CF card itself, not the format method. Formatting the new card in the Microtrack doesn't change anything, it still mounts fine. The old card, it seems, has a problem with Ubuntu, or maybe reformatting it will help? Right now I have data on it, but once I find a card reader to transfer it to my desktop I'll try that and see whether it was simply a bug in the formatting process (my guess is the card is just incompatible...)
Okay, it was the CF card itself, not the format method. Formatting the new card in the Microtrack doesn't change anything, it still mounts fine. The old card, it seems, has a problem with Ubuntu, or maybe reformatting it will help? Right now I have data on it, but once I find a card reader to transfer it to my desktop I'll try that and see whether it was simply a bug in the formatting process (my guess is the card is just incompatible...)