MacBook Pro hard disk storage really seem to be down on its luck this generation. First was the 3Gbps SATA transfers (now fixed), which honestly didn't affected but a marginal percentage of users upgrading to SSD themselves. Now comes word from a number of irate users on the Apple support forums that claim their HDDs, specifically those spec'd at 7200RPM, are suffering from performance issues and some audible clicking / beeping sounds. The folks at Other World Computing chimed in to say that it might have something to do with the Seagate Momentus 7200.4 G-Force drives, which takes anti-shock precautions that are possibly causing both noise and extra strain. If you're not hearing anything now, we wouldn't suggest you start getting hyper paranoid over the issue -- it's the internet, where things often get blown way out of proportion, in case you haven't noticed. If you're still worried / curious, hit up the read link for the full collection of anecdotes.