Redstone maybe I confused you. I'll try to be more clear.I have three softwares that should play dvd. Media player, Real player and Powerdvd. But it only plays one dvd. When I take out that dvd and put another dvd, it says "no disk in d:" If my dvd player which was at fault, it should not play any dvd. But it does play one. Why it says no disk in drive when i change to another dvd from the same drive. ( I have only one dvd player in my pc). It seems that my dvds in my d: is not recognized by any of the softwares when i change that one dvd that works. Auta dvd chalcha ra aru change garda no disk bhancha. Kina hola.