Statement of Volatility – Dell Latitude 5285

CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid the problem.

The Dell Latitude 5285 contains both volatile and non-volatile (NV) components. Volatile components lose their data immediately after power is removed from the component. Non-volatile (NV) components continue to retain their data even after power is removed from the component. The following NV components are present on the Latitude 5285 system board.

Table 1. List of Non-Volatile Components on System Board

Description

Reference

Designator

Volatility Description

User

Accessible for external data

Remedial Action (Action necessary to prevent loss of data)

SSD drive(s)

System

BIOS

M.2 - 2280

UH1

Non Volatile magnetic media, various sizes in GB. SSD (solid state flash drive).

Non Volatile memory, 128Mbit (16MB), and

Video BIOS for basic boot operation, PSA

(on board diags), PXE diags.

No

No

USB-Type C

PD

U22

LCD Panel

EEDID

EEPROM

System

Memory –

LPDDR3 memory

Part of panel assembly

Four pcs on board

LPDDR3 memory:

Non Volatile memory for USB type-C PD

F/W

Non Volatile memory, Stores panel manufacturing information, display configuration data

Volatile memory in OFF state (see state definitions later in text)

UD1,UD2,U

D3,UD4

Four pcs on board LPDDR3 memory.

System memory size will depend on chip size and must be between 4 GB,8GB and

16 GB.

No

No

Yes

Low level format

NA

NA

NA

Power off system

RTC CMOS

Video memory – frame buffer

Intel ME

Firmware

For UMA platform:

Using system memory

Conbine on

BIOS ROM

Security

Controller

Serial Flash

Memory

TPM

Controller

UC1 (PCH)

U1 (up-sell

USH daughter board)

U4246

Non Volatile memory 256 bytes

Stores CMOS information

Volatile memory in off state.

UMA uses main system memory size allocated out of main memory.

Non Volatile memory, Intel ME firmware for system configuration, security and protection

Non Volatile memory, 32 Mbit

(4Mbyte)

Non Volatile memory, 192K bits (24K bytes) ROM

No

No

No

No

No

NA

Power off system

N/A

N/A

N/A

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Description

Reference

Designator

Volatility Description

User

Accessible for external data

Remedial Action (Action necessary to prevent loss of data)

EC

ISH

UE1

Conbine on

BIOS ROM

Non Volatile memory, 16K bits (2K bytes)

ROM

Touch screen

Embedded

Flash

N/A

Non Volatile memory

No

No

No

N/A

N/A

N/A

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, 1866 MHz). 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,Modern standby, S4 and S5):

S0 state is the working state where the dynamic RAM is maintained and is read/write by the processor.

Modern standby is a standby mode state that is different from S3 mode. In this state, the dynamic RAM is maintained.

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 ™ 5285:

Model Number

Dell Latitude ™

5285

S0 v

Modern standby v

S4 S5 v v

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