NOTE:
The amount of time it takes for Disk Sanitizer to run can take several hours. Plug the computer
into an AC outlet before starting.
a.
Turn on or restart the computer, and then press
esc
while the “Press the ESC key for Startup Menu”
message is displayed at the bottom of the screen.
b.
Select the Security menu and scroll down to the Utilities menu.
c.
Select Hard Drive Tools.
d.
Under Utilities, select Disk Sanitizer, select the hard drive storing the data you want to clear, and
then follow the on-screen instructions to continue.
Nonvolatile memory usage
Nonvolatile
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.
For more
information,
see
Sure Start
(select models
only)
on page 101
.
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
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
Stores 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 the
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
programmable
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.
98
Chapter 13 Statement of memory volatility
Содержание ELITEBOOK 840 G4
Страница 1: ...HP EliteBook 840 G4 Notebook PC HP EliteBook 848 G4 Notebook PC Maintenance and Service Guide ...
Страница 4: ...iv Important Notice about Customer Self Repair Parts ...
Страница 6: ...vi Safety warning notice ...
Страница 10: ...x ...
Страница 59: ...10 Remove the keyboard 8 Reverse this procedure to install the keyboard Component replacement procedures 49 ...
