I checked the Tyros spec sheet and it states that it has 3.3 MB of onboard USER (disk) memory.

Is this USER memory space allocated for total USER: Registrations, Styles, Songs, & Sounds, as well as MusicFinder data? I assume that the Tyros OS is stored elsewhere, right?

I realize that you can increase onboard memory storage by adding an optional hard drive, but it would have been nicer if Yamaha could've included something more like 10 MB. Would that have costed much more for them to do this? Oh well. I'm sure most of us will be needing to purchase a hard drive for Tyros. Does the Tyros accept an 'off the shelf' HD? How much does a hard drive which will work on the Tyros cost? Thanks.