HP ZBook 15 Mobile Workstation Maintenance and Service Guide

Non-volatile 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
2 MB No Yes Only in
platforms that
support Sure
Start to
provide
protected
backup of
critical System
BIOS code, EC
firmware, and
critical PC
configuration
data.
Data cannot be written to this
device via the host
processor. The content is
managed solely by the HP
Sure Start Embedded
Controller.
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 limited
keyboard
controller data.
Using the F10 Setup utility or
changing the Microsoft®
Windows® date & time.
This memory is not write-
protected. HP
recommends password
protecting the F10 Setup
utility.
Controller (NIC)
EEPROM
64 Kbytes
(not customer
accessible)
No Yes Store NIC
configuration
and NIC
firmware.
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.
Keyboard ROM 64 Kbytes
(not customer
accessible)
No Yes Stores
firmware code
(keyboard,
mouse, &
battery
management).
Programmed at the factory.
Code is updated when the
system BIOS is updated.
A utility is required for
writing data to this
memory and is available
on the HP website.
Writing data to this ROM
in an inappropriate
manner can render the PC
non-functional.
DIMM Serial
Presence Detect
(SPD)
configuration
data
256 Bytes
per memory
module, 128
Bytes
programmab
le (not
customer
accessible)
No Yes Stores memory
module
information.
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.
Non-volatile memory usage
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