Hello, I replaced the HDD in my early 2011 2.2 i7 MBP with a Samsung 840 Series 500GB SSD. I was reading about SSD optimizations online and many places recommended turning off hibernation: http://sysadmin.flakshack.com/post/9...-os-x?ad22ade0 http://blog.alutam.com/2012/04/01/op...d/#hibernation I disabled it in the terminal, but this message was also returned. I wasn't really sure what it meant, so I was hoping someone here does. Thanks. **-MacBook-Pro:~ **$ sudo pmset -a hibernatemode 0 Warning: Idle sleep timings for "Battery Power" may not behave as expected. - Disk sleep should be non-zero whenever system sleep is non-zero. Warning: Idle sleep timings for "AC Power" may not behave as expected. - Disk sleep should be non-zero whenever system sleep is non-zero. **-MacBook-Pro:~ **$ sudo pmset -g Active Profiles: Battery Power -1 AC Power -1* Currently in use: standbydelay 4200 standby 0 womp 1 halfdim 1 hibernatefile /var/vm/sleepimage gpuswitch 2 sms 1 networkoversleep 0 disksleep 0 sleep 10 hibernatemode 0 ttyskeepawake 1 displaysleep 10 acwake 0 lidwake 1 Anyone have ideas? No really sure what is meant by "Idle sleep timings may not behave as expected." Does this mean problems may come about, or is it nothing to worry about? And if so, why the warning? My second question is sometimes terminal says "(sleep prevented by )" followed by a PID. Sometimes this is time machine, but other times it is blank (as seen in the image attached). Last, I noticed that the SMS sometimes is switched back on to "1", even though I set it to off. I was wondering if this happens to other people as welldo the settings change when turning the computer back on? Thanks.