To use Roland disks with your PC, you'll need the SDISK program. SDISK can read/write disks from various Roland samplers.
In the Roland U.S. site at http://www.rolandus.com/SUPPORT/SOFTWARE/PCSAMP.HTM you'll find the Sdisk utility and the System disks for download.

Also check the Roland Samplers Users Group (SGROUP) FTP Archive at www.generalconcepts.com/sgroup
for the Roland Sound Library sample disks.

Mgomes