sorry my bad.. i wasnt specific enough.. ok here goes.. its a NEC ND 3500 Drive. It recognises blank disks. bust has problems reading discs written by it (single session..no multi session discs) these are regular DVD-Rs RiTek, Memorex, etc... most of them read using Iso Buster but not using Windows Explorer..even nero says they are empty and they work find in other computers/standalon dvd players (if they are DVD-Videos) im using windows XP