Well the title says it all. If I insert a DVD in my internal DVD drive It's not recognised. However if I insert a CD, allow it to mount in the drive then eject it and re-insert the DVD the DVD is recognised.
This has only just started happening, previously DVDs were mounted and accessible no problems.I haven't changed any settings or installed any new software recently.
I also have a DVD writer which recognises DVD's no problem.
Win XP Home SP2
Don't know brand of DVD reader as it was installed in PC when bought. Itshows in device manager as IDE DVD ROM 16X