Macbook CD drive does periodic "seek" even when PC is asleep

My Macbook will be "fast asleep", the power light will be slowly pulsating, the machine has been inactive for so long that opening the screen does not revive the PC, you actually have to touch the power button to revive it, yet (it is in my room near where I sleep) I hear it periodically do a "seek" on the CD drive - you hear the CD's seek motor whirr and then nothing. This will happen at what appear to be (but may not be) random intervals.
Any idea why this is, and what (if anything) I can do to stop this behaviour?
Thanks,
Mike

You'd be shocked at the amount of traffic that goes through your Mac even under the most benign situations.
Frankly, it's difficult to diagnose this specific problem. If you're concerned about random traffic of any type on your system. a minimal investment in Little Snitch show you exactly what it is, and throttle unwanted traffic. Anytime something communicates to your computer, you'll see it.
In the meantime, I'd go to Control Panel/Security/Firewall and click Allow Only Essential Services and see if the behavior persists.

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