I'm trying to follow up on a variety of threads regarding issues with 500GB, 7200rpm drives with or without parking capability. There seems to be some consistency to comments that the EFI 1.7 firmware on Mid 2009 model MBPs has issues with some or all of the above. Some cases are fixed with replaced cables, others with firmware downgrades to 1.6 and still others with jumper changes to force sata I (1.5 gbs) mode on the drives.
While some people report "no problems" with such drives, they are often on older model MBPs with different firmware, or on 17" mbps with newer firmware.
See here Firmware update and SATA II hard drive:
http://discussions.apple.com/thread.jspa?threadID=2054387 and
http://discussions.info.apple.com/thread.jspa?threadID=2267098
Meanwhile Apple specifically states that 3gbs sata II drives "may not work" even with efi 1.7:
http://support.apple.com/downloads/MacBookPro_EFI_Firmware_Update_1_7
For my part i've had two rounds of issues with Hitatchi 500GB/7200 rpm drives factory installed from apple. In both cases the machines started pausing with spinning beachballs regularly and console reported disk0s2: I/O error. The first time i was unable to get the drive to format even attempting to map around bad blocks. That drive was replaced by apple. Now the same machine is starting to to show the same behavior after several months of use.
I've worked with macs for 20+ years. I've purchased over 1000 over my career for clients. The CEO of my company asked me yesterday why we have "so many hardware problems with macs" and if we "shouldn't buy macs anymore". What should I tell him Apple folks?