I have an Early 2009 MacBook, 6Gb RAM, with a 240Gb SSD (OCZ Vertex Plus R2). There are many pages advising people who have replaced their hard drive with an SSD to change some of the Power Management settings, using the Terminal pmset command. The main suggestions are to turn off Sudden Motion Sensor (as SSDs don't need such protection against mechanical movement), which seems fair enough; to change the hibernation state, so that OS X doesn't save a 6Gb sleep image of the memory to the SSD. Now, given that it's a 2009 MacBook, which I'm likely to get another two years out of; and it's only 6Gb out of 240Gb (I still have over 100Gb free): I'm not so worried about using up my precious SSD writes, as I expect the drive will still be good by the time I get a new Mac. However, I'm more concerned with maximising battery life (and I would rather that my un-saved docs were retained and not lost when the battery dies). The pmset manual suggests that the "standby" parameter can be used to set deep hibernation at some point after sleep is started. But my Mac doesn't seem to respond to the standby or standbydelay parameters. As it is, my MacBook has always trickled down its charge if I sleep it, rather than turning it off. My current settings are: Code: Currently in use: hibernatemode 3 acwake 0 lidwake 1 halfdim 1 sleep 15 ttyskeepawake 1 sms 0 hibernatefile /var/vm/sleepimage disksleep 10 displaysleep 10 Anyone know anything about this stuff? All the webpages I've seen just say "you don't want a hibernation sleep image".