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In addition, to clarify memory volatility and data retention in situations where the system is put in different ACPI
power states the following is provided (those ACPI power states are S0, S3, S4 and S5):
S0 state is the working state where the dynamic RAM is maintained and is read/write by the processor.
S3 is called “suspend to RAM” state or stand-by mode. In this state the dynamic RAM is maintained. Dell
systems will be able to go to S3 if the OS and the peripherals used in the system supports S3 state. Linux,
Win 7 and Win 8 support S3 state.
S4 is called “suspend to disk” state or “hibernate” mode. There is no power. In this state, the dynamic RAM is
not maintained. If the system has been commanded to enter S4, the OS will write the system context to a
non-volatile storage file and leave appropriate context markers. When the system is coming back to the
working state, a restore file from the non-volatile storage can occur. The restore file has to be valid. Dell
systems will be able to go to S4 if the OS and the peripherals support S4 state. Win 7 and Win 8 support S4
state.
S5 is the “soft” off state. There is no power. The OS does not save any context to wake up the system. No
data will remain in any component on the system board, i.e. cache or memory. The system will require a
complete boot when awakened. Since S5 is the shut off state, coming out of S5 requires power on which
clears all registers.
The following table shows all the states supported by Dell Latitude™ 3440:
Model Number
S0 S3 S4 S5
Dell Latitude™ 3450
X
X
X
X
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