HP ProDesk 400 G7 SFF, Maintenance And Service Manual

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i. Turn on or restart the computer, and then quickly press esc .
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 119
.
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.
ENWW Nonvolatile memory usage 115