Hey Beakybird,
I used to have to same problem of having the wrong disk in the keyboard, but I quickly discovered that once a style is loaded in the keyboard, you can switch disks while you're playing without encountering any problems.
Got to thinking about the HD a bit more, looked at the website again, and I'm trying to figure out how you would quickly move from, lets say disk 50 to disk 97. It appears as if first and foremost, you would have to know what is on each disk or have some printed directory that you could look up the styles and determine where they're located. Then, would you have to push the button 47 times to get to that disk? If this is the case, it would create an enormous amount of dead time between songs--not what the folks on the dance floor want.
Because the style files are quite small, I was able to put 28 on a single floppy disk and still had lots of room remaining. Then I renamed the files to the songs that I play and sing using that particular style. This pretty much eliminated any dead time between songs. I also set up the PSR-2000's MFD with "GIG FILES" which amounts to nothing more than 60 to 80 songs that I would normally do for a particular group or party. Again, this was the most effecient way to go and the dead time between songs is just about two seconds. You may want to take this into consideration before sending $300 bucks to someone for something that you've never been able to see, touch or play with.
Good Luck,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)