I crippled my late-2009 17" MBP after installing Windows 7, NTFS-3g and Macdrive. I'm not sure what the culprit was, but now the Mac is having issues and trying to repair the disk with the system software CD finds a "keys out of order" error that is not repairable. So I'll be reformatting the disk and restoring it from an recent Time Machine back up. Since I'm going to be essentially starting over, I thought this would be a good time to upgrade from the original 500GB/7400rpm hard drive to a 1TB drive but I see the latter only exists in 5400rpm at the fastest. My research has come up with contradictory statements. Will 5400rpm be noticeably slower? If so, should I get a 750GB/7400rpm drive instead? Will the 5400rpm drive use less battery power? My original drive is pretty battery-efficient at 7400rpm. Can anyone recommend a model of hard drive? At Newegg, my only 1TB choices are the Western Digital Scorpio Blue (5200rpm) or the Samsung Spinpoint M8 (5400rpm). And lastly, does the cache matter much (8MB vs. 16MB)? The 1TB drives only come in 8MB. I'm clearly no expert in hard drives so any help is appreciated.