Nonvolatile memory usage
Non Volatile
Memory Type
Amount (Size) Does this
memory
store
customer
data?
Does this
memory
retain data
when power
is removed?
What is the
purpose of this
memory?
How is data input into this
memory?
How is this memory write
protected?
HP Sure Start
flash (select
models only)
2 MBytes No Yes Provides
protected
backup of
critical System
BIOS code, EC
firmware, and
critical PC
configuration
data for select
platforms that
support HP
Sure Start.
Data cannot be written to this
device via the host processor.
The content is managed
solely by the HP Sure Start
Embedded Controller.
This memory is protected
by the HP Sure Start
Embedded Controller.
Real Time Clock
(RTC) battery
backed-up CMOS
configuration
memory (CMOS)
256 bytes No Yes Stores system
date and time
and noncritical
data.
RTC battery backed-up CMOS
is programmed using the
Computer Setup (BIOS), or
changing the Microsoft
Windows date & time.
This memory is not write-
protected.
Controller (NIC)
EEPROM
64 KBytes
(not customer
accessible)
No Yes Store NIC
configuration
and NIC
firmware.
NIC EEPROM is programmed
using a utility from the NIC
vendor that can be run from
DOS.
A utility is required to
write data to this memory
and is available from NIC
vendor. Writing data to
this ROM in an
inappropriate manner will
render the NIC non-
functional.
DIMM Serial
Presence Detect
(SPD)
configuration data
256 bytes per
memory
module, 128
bytes
programmabl
e (not
customer
accessible)
No Yes Stores memory
module
information.
DIMM SPD is programmed by
the memory vendor.
Data cannot be written to
this memory when the
module is installed in a
PC. The specific write-
protection method varies
by memory vendor.
System BIOS 4 to 5 MBytes Yes Yes Store system
BIOS code and
PC
configuration
data.
System BIOS code is
programmed at the factory.
Code is updated when the
system BIOS is updated.
Configuration data and
settings are input using the
Computer Setup (BIOS) or a
custom utility.
A utility is required for
writing data to this
memory and is available
on the HP website; go to
http://www.hp.com/
support, and select your
country. Select Drivers &
Downloads, and then
follow the on-screen
instructions.
NOTE: Writing data to
this ROM in an
inappropriate manner can
render the PC non-
functional.
Intel Management
Engine Firmware
(present in only
1.5 MBytes or
5 MBytes
Yes Yes Stores
Management
Engine Code,
Management Engine Code is
programmed at the factory.
Code is updated via Intel
The Intel chipset is
configured to enforce
hardware protection to
54 Chapter 9 Statement of memory volatility
To Next Page
Loading...
Need help?
General
Weight and Dimensions
