Two DVD rw's One of them not showing (Win XP Pro)

Two DVD rw's One of them not showing (Win XP Pro)
I would need a bit more information. Is it showing up in the device manager but not in My Computer?

Could be a co-confliction between the to drives if they are different model. Also you would need to install drivers for both Roms if they where different. But would need more info to tell.