What is the difference between “standby mode” and “hibernation” mode?
When your machine is on “standby mode,” the hard disk and monitor are turned off. In addition, the CPU is throttled down to its lowest-power state while the memory remains active. Waking up your desktop from standby mode takes about a few seconds. In hibernation mode, all current applications running in memory are saved to the hard-drive and the computer is turned off. When resuming from this mode, the computer appears exactly as it did before hibernation. Waking up from hibernation mode takes a bit longer than waking up a machine from standby mode.