I'm no computer whiz (being a decent enough keyboard player is my own salvation), but take a look at the following page (go to the bottom of the menu on the left hand side):
http://silverhawk33.tripod.com/glenskorgsite/id4.html

Granted, it's all Korg, but just maybe the hard drive solutions here will work for you Yamaheads, also. Hope this helps.

Oops! Sorry, I should have said scroll down the light-green panel on the left hand side to "Installing a Hard Drive"

I don't belive they're compatable, and unfortunately, the folks at Yamaha are not readily parting with this type of technical information.

Gary

Anyone interested, this device has more than doubled in price. The seller, Sergiy, warned me that the price would go up. I thought that he was just using that to get me to buy. Holy moley. I hope he honors the price that we have agreed to in emails. If anyone else in the USA wants to buy, I just found out my sister's mother-in-law is in Germany for the next couple of weeks, and if you make arrangements with me, I might be able to help you get it at the old price. My sister's mother-in-law is the concierge for various big-name orchestras and international acts from Europe. She lives half of the year in Europe and half of the year in Philadelphia.

Beakybird