HP ProBook 635 Aero G7, Maintenance And Service Manual, Page: 105 / 119

ii. Select the Security menu and scroll down to the Utilities menu.
iii. Select Hard Drive Utilities.
iv. Under Utilities, select Disk Sanitizer, select the hard drive with the data that you want to clear,
and then follow the on-screen instructions to continue.
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.
Nonvolatile memory usage
Use this table to troubleshooting nonvolatile memory usage.
Table 11-1 Troubleshooting steps for 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 entered into
this memory?
How is this memory
write-protected?
HP Sure Start
flash (select
models only)
8 MB No Yes Provides
protected
backup of
critical System
BIOS code, EC
firmware, and
critical
computer
configuration
data for select
platforms that
support HP
Sure Start.
For more
information,
see Using HP
Sure Start
(select
products 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
Computer Setup (BIOS), or
by changing the Windows
date & time.
This memory is not
write-protected.
Controller (NIC)
EEPROM
64 KB (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 must be
used 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
computer. The specific
Nonvolatile memory usage 97