Put your portable Mac laptop to sleep
Few users give much thought to the process of putting their Apple Mac to sleep mode. They just assume that sleep will help conserve Mac’s battery, and let pick up right where we left off. But what happens when you put it to sleep in order to save energy and quickly turn back on?
Actually, Apple supports three different versions of sleep and very few users know which version of sleep their Mac are using.
In fact, each of these three versions or Mac Sleep Modes which Apple has provided since 2005, has its benefits and drawbacks. You can thus choose between Sleep Mode, Hibernation Mode and Safe Sleep.
Sleep Mode (sometimes called hibernate mode 0): This is the default mode for desktop Macs. When in this mode, Mac’s RAM is left powered on. This allows your computer to wake up quickly, as there’s no need to load anything from the hard drive.
Hibernation Mode (sometimes called hibernate mode 1): The default sleep mode for devices released before 2005. The contents of RAM are copied to your hard drive before the Mac enters to sleep. The power is removed from the RAM. When the user wakes his portable up, the hard drive first writes the data back to the RAM. That means that the device’s wake time is a bit slower than in Sleep Mode.
Safe Sleep (called hibernate mode 3): Since 2005, this is the default mode for Apple portables. In this mode RAM contents are copied to the hard drive before the “sleep”. Writing to the hard drive is a safeguard. However, the RAM remains powered while the Mac is sleeping. Wake time is very fast because the RAM still contains the necessary info. In this case, should something happen (for example, a battery failure), user can still recover the data. Keep in mind that not all Apple portables are capable of supporting this mode.
As you can see the only difference between all these Mac sleep modes is whether the contents of RAM are first copied to the hard drive before the portable enters sleep. Once RAM contents are copied the processor is put into a low-power state in the three sleep modes. Besides, the video output is disabled and connected displays will enter their own low-power state, if supported. Apple-supplied hard drives and optical media drives spin down (as do most of the third-party internal and external drives). AirPort functions, audio input and output are disabled. As to Ethernet port, it is mostly disabled, but this actually depends on system settings, which can allow the Ethernet port to respond to a WOL (Wake on Lan) signal. USB ports have limited functionality (respond to keyboard). Modem and Bluetooth will also be disabled, but this depends on whether the modem is configured to wake when it detects a ring and if the Bluetooth system preference allows Bluetooth devices to wake your Mac.
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