I was asking if there was one.
I don't own a 660, nor any other marantz gear, so have spent no time on their website. Some other brands had updated firmware available in their support>downloads area and one that I'm aware of (M-Audio Microtrack2496) had a firmware update that addressed an issue with file size - 2gb max to 4gb max. Thought maybe marantz had issued an update that might fix the issue you're having.
If T-90's suggestion of formatting in the computer first doesn't help, you might want to see if there is a firmware update available.