It's bad, very bad!

How can one trust an OS that shows a device as raw, meaning not showing any file system at all, and still complete copy, remove or paste actions on the given device???

You really should take actions here, not on your N900.

Sorry for this off-topic rant.

On-topic: Use the above commands in X-Terminal application to see, if that makes any changes on the way your PC approaches the internal card of the N900.