-50 error with Toast 6

[Bumala, Robert W]

Hi all,
  Well, I just upgraded my cube with a DVD burner, and toast 6.  I'm having a problem in that when I try to access the disk, such as to get disk info, or burn a disk, Toast reports back an error -50 unreliable communication.  When I use the software that came with the disk, Dragonburn, it has no such problems.  Does anyone know what this error means?  I've looked on Roxio's site, and there's nothing.
Thanks,
Bob.

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Robert W. Bumala
Staff Circuit Design Engineer 
Lockheed Martin Advanced Technology Center

Lockheed Martin Space Systems Company
Org. L9-42 Bld. 255
3251 Hanover Street
Palo Alto, CA 94304-1191

Phone: (650) 354-5918
Fax: (650) 424-3333
EMail: Robert.W.Bumala at lmco.com