Dell Optiplex 9020M Troubleshooting Statement Of Volatility

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Statement of Volatility – Dell OptiPlex 9020M
CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid the
problem.

The Dell OptiPlex 9020M 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 9020M motherboard:
List below contains volatile and non-volatile memory ICs used in Dell OptiPlex 9020M.

Description

Reference
Designator

Volatility Description

User
Accessible
for external
data
No

N/A

Remedial Action
(action necessary to
lose data)

Embedded
Flash
memory in
embedded
controller
SMSC
SCH5555VNU
System BIOS

U6

2 K of on-chip ROM and 256 bytes
of on-chip RAM

SPI_1, SPI_2

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

No

N/A

TPM

UF2

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

No

N/A

System
Memory –
DDR3/DDR3L
DIMM
memory

Connectors:
DIMM1, DIMM2

Volatile memory in OFF state (see
state definitions later in text)
One to two modules will be
populated. System memory size
will depend on DIMM modules
and will be between 4 GB to 8 GB.

Yes

Power off system.

System
memory
SPD
EEPROM

On memory
DIMM(s) – one,
two present

No

N/A

RTC CMOS

Battery

Non-volatile EEPROM memory. 2
Kbits (256 bytes).One Device
present on each DIMM.
Stores memory-manufacturer data
and timing information for correct
operation of system memory.
Volatile battery back-backed
CMOS memory 256 bytes. Stores
CMOS information.

No

Removing the on
board coin-cell
battery.

May 2014

User
Accessible
for external
data
No

Remedial Action
(action necessary to
lose data)

Description

Reference
Designator

Volatility Description

Video
memory –
type – see
next column

UMA
architecture- uses
system
DDR3/DDR3L.

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

Hard drive

User replaceable

Non-volatile magnetic media,
various sizes in GB.

Yes

Low-level format.

CDROM/RW/
DVD/
DVD+RW/
Diskette
Drives

User replaceable

Non-volatile optical/magnetic
media.

Yes

Low-level
format/erase.

Enter S3-S5 state
below.

All other components on the motherboard will lose data once power is removed from the system. Primary power loss (Unplug
the power cord and remove the battery) will destroy all user data on the memory (DDR3/DDR3L, 1600 MHz). Secondary power
loss (removing the on board coin-cell battery) will destroy 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 Windows7 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.

The following table shows all the states supported by Dell OptiPlex 9020M.
Model Number

S0

Dell OptiPlex
9020M

X

S1

S3

S4

S5

X

X

X

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