Apparently Mac OS X has three hibernation modes (as outlined below from an official Apple document): a. Always save the RAM content to HD and hibernate (this is the default), b. Dont save RAM content to HD (I think this is the "regular sleep" and risks losing data if power is interrupted), and c. Save RAM content to HD and hibernate when the battery power is at a critical level. I am planning to change the default scenario (point (a) above) to the (c) to avoid writing RAM content to HD every time the lid is closed. Has anyone changed the hibernation modes before? If so, has there been any problems with battery life, data loss, etc etc? Thanks in advance!