When windows explorer lists the drive as a DVD-RAM drive it means that it has DVD-RAM support [in addition to anything else]. This is normal if the drive has DVD-RAM capability.
As for making the DVD from AVI - what software are you using? Are you ending up with IFO’s, BUP’s and VOB’s [simple but stupid mistakes from some people]? And what are you using to burn it? Nero? Are you selecting DVD-Video type and putting the VOBs, BUPs and IFOs in the Video_TS folder? Does the Reallocation Process finish correctly?
Otherwise, maybe the type of discs you’re using may not be recognised by the players you are trying them on - try DVD-R and DVD+R and see if there’s a difference. See whether booktyping is possible on that burner to improve compatibility with DVD+R discs?