Toshiba Portege 4005 User Guide - Page 108

Hibernation command, data is lost if the battery discharges while the computer is

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108 Power Management Powering down the computer 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 mode 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 mode in which you left it. Factors to consider when choosing Hibernation:  While in Hibernation mode, the computer uses no battery power.  Because the state of the system is held on the hard disk, no data is lost if the battery discharges while the computer is in Hibernation mode.  When starting up again, this choice uses less time and battery power than the Shut down option. But it uses a little more time and battery power to start up than the Standby option, because information is being retrieved from the hard disk instead of from memory.  On restarting, the computer returns to the mode in which you left it, and opens all the programs and files you were using.

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108
Power Management
Powering down the computer
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 mode 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
mode in which you left it.
Factors to consider when choosing Hibernation:
While in Hibernation mode, the computer uses no battery
power.
Because the state of the system is held on the hard disk, no
data is lost if the battery discharges while the computer is in
Hibernation mode.
When starting up again, this choice uses less time and battery
power than the Shut down option. But it uses a little more time
and battery power to start up than the Standby option, because
information is being retrieved from the hard disk instead of
from memory.
On restarting, the computer returns to the mode in which you
left it, and opens all the programs and files you were using.