I looked, but is there a list of error codes somewhere?

[janiskfp]

I get various error codes using TC Pocket, mostly "error 13 changing to dir" on storage cards, which is my first indication the card is going bad. What exactly does it mean? Is there a list somewhere?

[ghisler(Author)]

Yes there is:
http://msdn.microsoft.com/en-us/library/ms681382(VS.85).aspx

The same codes are used on Windows and Windows Mobile.

[siealex]

Try to clean the storage card pins, I had the similar problem.