Is it normal for MacBook Pro CD/DVD drive to makes noise on wake after long sleep Every time I put my MacBook Pro (13in, mid-2012) to sleep and shut the lid, then wait at least 20 mins then open the lid and wake it up, my CD/DVD drive makes an odd sound as if it thinks there's a disk in there to read but then realizes there isn't and stops the sound.

Many of my friends own MacBook Pros and none of their CD/DVD drives do this on wake after a long sleep. I should probably also mention that this sound only started happening about 6 months after I bought it, it's now 1.5 years old.

So, is it normal for my MacBook Pro to make a sound on wake after a long sleep?
Yes.

After all, OS X wants to allow you to access what's on the disc currently inside the drive. When you eject a disc, the system reacts by no longer showing the disc on the desktop or in Finder. When you insert a disc, the system reacts by showing the disc on the desktop and in Finder.

When the system is asleep, it's no longer keeping track of whether a disc has been ejected, inserted, or replaced with a different disc. It has to check what's in the drive when it wakes up in order to react properly to what's there.