White Papers

June 2021
Statement of Volatility – Dell Latitude 5421
CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid the problem.
The Dell Latitude 5421 contains both volatile and non-volatile components. Volatile components lose their data
immediately after power is removed from the component. Non-volatile components continue to retain their
data even after power is removed from the component. The following Non-volatile components are present on
the Latitude 5421 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) M.2 – 2280/2230 Non-Volatile magnetic media, various
sizes in GB. SSD (solid state flash drive).
No Low level format
System
BIOS/EC
UC2 (32 MB)
Non-Volatile memory, Video BIOS for
basic boot operation, PSA (on board
diagnosis), PXE diagnosis.
No NA
Thunderbolt
EEPROM
UT7 (1 MB) Non-Volatile memory No NA
LCD Panel
EEDID
EEPROM
Part of panel
assembly
Non-Volatile memory, Stores panel
manufacturing information, display
configuration data
No NA
System
Memory –
DDR4
memory
Two DIMM on
board DDR4
memory:
JDIMM1/JDIMM2
Volatile memory in OFF state (see state
definitions later in text)
Yes Power off system
RTC CMOS PCH-UH1 Non-Volatile memory 256 bytes
Stores CMOS information
No NA
Video
memory –
frame buffer
For UMA platform:
Using system
memory
For DSC platform:
UV34, UV35
Volatile memory in off state.
UMA uses main system memory size
allocated out of main memory.
No Power off system
Intel ME
Firmware
Combine on BIOS
ROM
Non-Volatile memory, Intel ME firmware
for system configuration, security, and
protection
No N/A
Security
Controller
Serial Flash
Memory
Combine on BIOS
ROM
Non-Volatile memory
No
N/A
TPM
Controller
UZ4 Non-Volatile memory, 192K bits (24K
bytes) ROM
No N/A
ISH Combine on BIOS
ROM
No N/A