Hi New poster here hope someone can help I have just bought a Sony AW G170 DVD writer (OEM) and installed as per the instructions in my Dell manual Now the original CD drive has disappeared (was d:/) and the new drive doesn't seem to be picking up what it is (although an e:/ is showing) I assume I've done something very basic wrong. Have checked the power and data cables and they are firmly in place. Thanks for any help.