In my personal experience, DVD+RW/R and DVD-RW/R discs can be read by my TR1. I suspect the TR2 (and TR3s for that matter) can do the same even though they’re all using different model optical disc drives.
Of course, my home deck is another matter…it only reads +R and -R….no RW (plus or minus) support for me. I guess it’s ok…at least it can read the more common types…