Thanks Jon, that's great news. I'm now guessing that it's the YAM USB floppy drive that isn't allowing me to back-up my albums to my home server (reads all regular floppies with midi files, just not some Smart Pianosoft floppies) I'm ordering a new drive on Amazon today and will test this out.
One really excellent feature of the MarkIV, DKC-850, E3 models is the ability to play Smart Pianosoft music with the associated commercial CD. Having the piano accompany favorite artists/albums makes the Disklavier really shine. Having those files (.mid & .wav) files synced into one .wav (wave) file using the MID2PianoCD program played from a laptop/PC/home server/iWhatever to the piano with the iPhone/iPad Disklavier app (or the DKVBrowser program) is truly marvelous!
Buying the Smart Pianosoft albums through Yamahamusicsoft.com in download format let's you accomplish this easily and avoids the silly (and delicate) floppy disks. However, many titles from Yamaha, Hal Lenoard, Sheetmusicplus (or eBay/Amazon) are still on 1980's style 3.5 floppy disks. For some reason (probably outdated notions of media copyright protection) the floppies can ONLY be backed up to the memory on these pianos and not directly copied to another floppy for safe keeping or to extract the .mid (midi) files for the process mentioned above. I hope Yamaha and their distributors will take a page from Apple et al and let people use the music they purchase they way they want then provide more titles/albums via download from their sales websites.
After all the more albums/titles/songs made available the more people will love these amazing instruments and the more Disklaviers Yamaha will ultimately sell.
Thanks once again to the originators of this fantastic forum and to all of those who participate making it the one of the most relevant resources for Disklavier owners, dealers, and technicians