always try the steps in order! Plan A - Disc Doesn't Eject after Dragging to Trash Here are the steps I usually take in trying to eject a CD or DVD-in order from least likely to damage the disc and/or my Mac, to most likely.
Often a dialog pops up and says 'the disc is in use' (but it doesn't specify what application is using it!), or worse, there is no error-the disc just won't come out. Sometimes, I just want to get a dratted disc out of the computer, but dragging it to the trash, or pressing the 'Eject' key won't work.
Most of the time, I'm extremely happy with Apple's decision to make all their physical media (CD/DVD) drives slot-loading, as it means there's one less part to accidentally break off my Mac, and it just looks so darn pretty! But every now and then, I have a hellish experience with the drive.