Dell OptiPlex 9020 Manuel - Page 2
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Reference
Description
Designator
RTC CMOS
BATTERY
Video
UMA
memory –
architecture-
type – see
uses system
next column
DDR3.
Hard drive
User replaceable
CD-
User replaceable
ROM/RW/
DVD/
DVD+RW/
kette
Dis
Drives
CAUTION: All other components on the system board lose data if power is removed from the system. Primary power
loss (unplugging the power cord and removing the battery) destroys all user data on the memory (DDR3). Secondary
power loss (removing the on-board coin-cell battery) destroys system data on the system configuration and time-of-
day information.
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, S1, S3, S4 and S5):
S0 state is the working state where the dynamic RAM is maintained and is read/write by the processor.
S1 state is a low wake-up latency sleeping state. In this state, no system context is lost (CPU or chip set)
and hardware maintains all system contexts.
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
and Windows 7 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. Windows 7
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.
Volatility Description
Volatile battery back-backed
CMOS memory 256 bytes.
Stores CMOS information.
Volatile memory in off state.
UMA uses main system
memory size allocated out of
main memory.
Non-volatile magnetic media,
various sizes in GB.
Non-volatile optical/magnetic
media.
Remedial Action
User Accessible
(action necessary to
for external data
lose data)
No
Removing the on
board Coin Cell
battery.
No
Enter S3-S5 state
below.
Yes
Low level format.
Yes
Low level
format/erase.
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