Shut Down Command; Hibernation Command - Toshiba Satellite Pro 4600 Series Supplemental Manual

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Learning the Basics
Powering down the computer
TECHNICAL NOTE: Before using any of these methods to
power down your computer, save your files and make sure
the disk activity lights are off.
If you change your mind and decide to continue working
after all, wait a few seconds before turning the computer on
again.

Shut down command

The Shut down command powers off the computer. When you
start up again, the computer runs a self-test and loads the operating
system. You must open any programs and files you want to use.
Factors to consider when choosing Shut down:
No power is used while the computer is shut down. This is the
most efficient mode if you will be away from your computer
for an extended time.
Restarting from Shut down uses the most time and battery
power.
When starting up again, the system does not automatically
open the programs and files you were previously using.

Hibernation command

The Hibernation command powers off the computer, but it first
saves the current state of the computer to the hard disk. Since
Hibernation does not require power to maintain the saved
information, the system settings are retained indefinitely.
Restoring information from the hard disk takes longer than
restoring it from memory. When you start up again, the computer
runs a self-test, loads the operating system, and then returns to the
state in which you left it.