Non-volatile memory usage

Non Volatile

Amount (Size)

Does this

Does this

What is the

How is data

How is this

Memory Type

 

memory store

memory retain

purpose of this

input into this

memory write

 

 

customer data?

data when

memory?

memory?

protected?

 

 

 

power is

 

 

 

 

 

 

removed?

 

 

 

 

 

 

 

 

 

 

Real Time Clock

256 Bytes

No

Yes

Stores system

Using the F10

This memory is

(RTC) battery

 

 

 

date and time

Setup utility or

not write-

backed-up CMOS

 

 

 

and limited

changing the

protected. HP

configuration

 

 

 

keyboard

Microsoft

recommends

memory (CMOS)

 

 

 

controller data.

Windows date

password

 

 

 

 

 

and time.

protecting the

 

 

 

 

 

 

F10 Setup

 

 

 

 

 

 

utility.

 

 

 

 

 

 

 

Controller (NIC)

64 KBytes (not

No

Yes

Store NIC

Using a utility

A utility is

EEPROM

customer

 

 

configuration

from the NIC

required to write

 

accessible)

 

 

and NIC

vendor that can

data to this

 

 

 

 

firmware.

be run from DOS.

memory and is

 

 

 

 

 

 

available from

 

 

 

 

 

 

NIC vendor.

 

 

 

 

 

 

Writing data to

 

 

 

 

 

 

this ROM in an

 

 

 

 

 

 

inappropriate

 

 

 

 

 

 

manner will

 

 

 

 

 

 

render the NIC

 

 

 

 

 

 

nonfunctional.

 

 

 

 

 

 

 

Keyboard ROM

64 KBytes (not

No

Yes

Stores firmware

Programmed at

A utility is

 

customer

 

 

code (keyboard,

the factory.

required for

 

accessible)

 

 

mouse, &

Code is updated

writing data to

 

 

 

 

battery

when the system

this memory and

 

 

 

 

management).

BIOS is updated.

is available on

 

 

 

 

 

 

the HP website.

 

 

 

 

 

 

Writing data to

 

 

 

 

 

 

this ROM in an

 

 

 

 

 

 

inappropriate

 

 

 

 

 

 

manner can

 

 

 

 

 

 

render the PC

 

 

 

 

 

 

nonfunctional.

 

 

 

 

 

 

 

DIMM Serial

256 Bytes per

No

Yes

Stores memory

Programmed by

Data cannot be

Presence Detect

memory

 

 

module

the memory

written to this

(SPD)

module, 128

 

 

information.

vendor.

memory when

configuration

Bytes

 

 

 

 

the module is

data

programmable

 

 

 

 

installed in a PC.

 

(not customer

 

 

 

 

The specific

 

accessible)

 

 

 

 

write protection

 

 

 

 

 

 

method varies

 

 

 

 

 

 

by memory

 

 

 

 

 

 

vendor.

 

 

 

 

 

 

 

System BIOS

4 to 5 MBytes

Yes

Yes

Store system

System BIOS

A utility is

 

 

 

 

BIOS code and

code is

required for

 

 

 

 

PC configuration

programmed at

writing data to

 

 

 

 

data.

the factory.

this memory and

 

 

 

 

 

Code is updated

is available on

 

 

 

 

 

when the system

the HP website.

 

 

 

 

 

BIOS is updated.

Writing data to

 

 

 

 

 

Configuration

this ROM in an

 

 

 

 

 

data and

inappropriate

 

 

 

 

 

settings are

manner can

102 Chapter 10 Statement of Volatility