I have been using minidiscs since the mid 90's starting with the MZ-R55 and have progressed that I have both the MZ-M100 and M200 units which have never given me any problems. Both of my boys like using the minidiscs also. I started them with the MZ-DN430 (strictly NET MD) and they are now moving to the M100's. When my XP computer started dying, I used the Sonicstage backup tool to move all of the music in sonicstage (ver 4.3) to an external hard drive so that I could reinstall it on a new co