By default Eye-Fi cards scan the DCIM folder (and subfolders) used by most digital cameras for new images to upload.

Is there a way of changing this to a different folder?

In my particular case I'm using a Kodak photo scanner (P461) that uses a PHOTO(N) folder format to store the scanned images, as far as I know the device has no configuration interface to alter this setting so that doesn't seem to be an option.

This topic on the Eye-Fi forums is the closest I've come to a solution, but a perfunctory investigation of Disk Probe doesn't make it obvious what needs to be modified on the card.