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.

154 Chapter 14 Statement of Volatility