HP ZBook 17 manual Non-volatile memory usage, Cmos

Non-volatile memory usage

Non Volatile	Amount	Does this	Does this	What is the	How is data input into	How is this memory
Memory Type	(Size)	memory	memory	purpose of	this memory?	write protected?
		store	retain	this
		customer	data when	memory?
		data?	power is
			removed?
Real Time Clock	256 Bytes	No	Yes	Stores system	Using the F10 Setup utility	This memory is not write-
(RTC) battery				date and time	or changing the Microsoft®	protected. HP
backed-up				and limited	Windows® date & time.	recommends password
CMOS				keyboard		protecting the F10 Setup
configuration				controller data.		utility.
memory (CMOS)
Controller (NIC)	64 Kbytes	No	Yes	Store NIC	Using a utility from the NIC	A utility is required to
EEPROM	(not customer			configuration	vendor that can be run from	write data to this
	accessible)			and NIC	DOS.	memory and is available
				firmware.		from NIC vendor.
						Writing data to this
						ROM in an
						inappropriate manner
						will render the NIC non-
						functional.

Keyboard ROM	64 Kbytes	No	Yes	Stores	Programmed at the factory.
	(not customer			firmware code	Code is updated when the
	accessible)			(keyboard,	system BIOS is updated.
				mouse, &
				battery
				management).

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	256 Bytes	No	Yes	Stores memory	Programmed by the memory	Data cannot be written
Presence Detect	per memory			module	vendor.	to this memory when the
(SPD)	module, 128			information.		module is installed in a
configuration	Bytes					PC. The specific write
data	programmabl					protection method varies
	e (not					by memory vendor.
	customer
	accessible)

System BIOS	4 to 5	Yes	Yes	Store system	System BIOS code is
	MBytes			BIOS code and	programmed at the factory.
				PC	Code is updated when the
				configuration	system BIOS is updated.
				data.	Configuration data and
					settings are input using the
					F10 setup utility or a custom
					utility.

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.

156 Chapter 14 Statement of Volatility