Dell Optiplex 7020 Quick Reference Guide Statement Of Volatility

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Statement of Volatility – Dell OptiPlex 7020
CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid the
problem.

The Dell OptiPlex 9020 contains both “volatile” and “non-volatile” (NV) components. Volatile components lose
their data immediately upon removal of power from the component. Non-volatile components continue to retain
their data even after the power has been removed from the component. The following volatile and NV
components are present on the Dell OptiPlex 7020 motherboard:

Embedded
Flash
memory in
embedded
controller
SMSC5555
System
BIOS

UO1

96K bytes non-volatile
memory.
2K bytes non-volatile memory
for keyboard controller.

No

Remedial Action
(action necessary to
lose data)
N/A

SPI_1, SPI_3

Non-volatile memory, 64M bits
(8MB), 32Mbits (4MB) System
BIOS and Video BIOS for
basic boot operation, PSA (on
board diagnostics.)

No

N/A

TPM

UF2

4K bytes non-volatile memory
located in the TPM module.

No

N/A

System
Memory –
DDR3 DIMM
memory

Connectors :
DIMM1, DIMM2,
DIMM3, DIMM4

Yes

Power off system.

System
memory
SPD
EEPROM

On memory
DIMM(s) – one,
two, three, or
four present

Volatile memory in OFF state
(see state definitions later in
text)
One to four modules will be
populated. System memory
size will depend on DIMM
modules and will be between
1GB to 8GB.
Non-volatile EEPROM
memory. 2K bits (256 bytes).
One Device present on each
DIMM.
Stores memory manufacturer
data and timing information for
correct operation of system
memory.

No

N/A

Description

Reference
Designator

Volatility Description

User Accessible
for external data

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Reference
Designator

RTC CMOS

BATTERY

Volatile battery back-backed
CMOS memory 256 bytes.
Stores CMOS information.

No

Video
memory –
type – see
next column

UMA
architectureuses system
DDR3.

Volatile memory in off state.
UMA uses main system
memory size allocated out of
main memory.

No

Enter S3-S5 state
below.

Hard drive

User replaceable

Non-volatile magnetic media,
various sizes in GB.

Yes

Low level format.

CD-

User replaceable

Non-volatile optical/magnetic
media.

Yes

Low level
format/erase.

ROM/RW/
DVD/
DVD+RW/
Diskette

Volatility Description

User Accessible
for external data

Remedial Action
(action necessary to
lose data)
Removing the on
board Coin Cell
battery.

Description

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-ofday 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.
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The following table shows all the states supported by Dell OptiPlex 7020

Model Number
Dell OptiPlex
7020

S0
X

S1

S3
X

S4
X

S5
X

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