I don't know about your MP, but my stock Seagate 320 GB HD was very noisy. It would whine when spinning up from sleep and give lots of ticks and clicks when accessing data. I pulled it out and installed four different HD's:
2 WD Caviar 500GB and 2 Seagate 320GB 16MB cache. Those four HD's produce collectively less noise than the original single Seagate 320GB HD. I installed the original HD in an external USB 2/eSATA case and use it for archiving.
2 WD Caviar 500GB and 2 Seagate 320GB 16MB cache. Those four HD's produce collectively less noise than the original single Seagate 320GB HD. I installed the original HD in an external USB 2/eSATA case and use it for archiving.