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I'm not sure if this is what you meant but mine always has a prompt of some kind (varied between phones) for connecting to pc. I'm not sure if there is a way to disable that or if it was phone specific.

No. My Sony xperia does not ask. It automatically mounts in osx

icons popped up in the notification bar that show its being mounted through USB for all the android devices i have ever owned: droid, htc thunderbolt, galaxy s3, xoom...

Since you've got an N900, you can do even better than that:

- Different filesystems (unlikely this would work with anything but FAT based).

- Encrypted filesystems.

- Simply disabling the capability (I can't remember the last time I used USB data transfer on mine).

Of course, it's easy to do the above on a phone you actually have control over. Sorry, iPhone users.