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  Enable Safe Sleep/Hibernate on your Mac
By javester
Macs users are familiar with Sleep mode. Compared to Windows' Standby mode, OS X's Sleep mode makes for instantaneous sleep and wakeup.

However, that response time comes at a price. For Mac portables, the battery can be slowly drained empty even with this low-power mode. With our MBP, Sleep Mode is only good for two days.

Not only is this inconvenient, you can potentially loose valuable information.

With OS X 10.4, Apple introduced a new feature called Safe Sleep. According to Apple:
Safe Sleep ensures that data stored in main memory will not be lost should the system shut down due to a loss of power during sleep mode. Prior to your system entering sleep, Safe Sleep automatically saves the contents of main memory […] to the hard drive. In the event the battery becomes completely depleted while the system is asleep, the computer will shut down. But when a power adapter is connected or a freshly charged battery is installed, the PowerBook can be restarted and it will automatically return to the desktop state that existed prior to entering sleep.
Thing is, its disabled by default.

To enable Safe Sleep, you can follow this involved howto at

Alternatively, you can just download Hibernate Preferences and you're just three clicks away.


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