Rick - thank you. I just realized when I opened the Sample Manager link on the web page what it actually was. My daughter has an LK-280 and I thought it might be for the home keyboards that have sampling capability.
Oddly enough, it's not called the MZ-X500 Sample Manager, that would have clued me in earlier. The product page doesn't mention it being called the Sample Manager either. http://www.casiomusicgear.com/products/mz-x-series/mz-x500
I was on the fence between the Roland Juno DS-61 and this nails it. I've got hundreds of sample CDs and Gigs of files saved that are useful again in a live situation with this. Dragging around the old K2600 and SCSI drives will be a thing of the past.