Reference Guide
Description
Reference
Designator
Volatility Description
User
Accessible
for external
data
Remedial Action (Action
necessary to prevent loss of
data)
M.2 SSD
J220
Non Volatile magnetic media,
various sizes in GB
Yes Low level format
CD-
ROM/RW/
DVD/
DVD+RW/
Diskette
Drives
User
replaceable
Non Volatile optical/magnetic
media
Yes Low level format/erase
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 (LPDDR3).
Secondary power loss (removing the on-board coin-cell battery) destroys system data on the system configuration
and time-of-day information.
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 (DDR4, 2133MHz). Secondary power loss (removing the on board coincell 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. Windows 10/8.1/7, Ubuntu 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 10/8.1/7, 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 7440
Model Number
S0
S1
S3
S4
S5
Dell OptiPlex
7440
X
X
X
X
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or other countries.