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 troubleshoot nonvolatile memory usage.
Table 12-1 Troubleshooting steps for nonvolatile memory usage
Memory type Volatility; size Store
user
data
Retain
power if
removed
Purpose How input to memory How write protected
System BIOS Non-volatile,
64 MB
Yes Yes Stores BIOS code
and computer
setting and
password data
BIOS code
programmed at
factory. Config and
settings input using
menu
Utility required to
write data to
this memory. See
www.hp.com/support
DRAM Volatile; user
configurable
Yes No Stores OS and
app real time data
By OS behavior User accessable
Embedded
controller
Non-volatile;
128 KB chip
embedded
No Yes Controller FW Programmed at
factory
Utility required to write
data to this memory,
combined with BIOS
update file.
Thunderbolt Non-volatile; 1
MB
No Yes Controller FW Programmed at
factory
Utility required to write
data to this memory,
combined with BIOS
update file.
Type-C PD
controller
Non-volatile;
N/A
N/A N/A Controller FW Programmed at
factory
Utility required to write
data to this memory,
combined with BIOS
update file.
GFX card
VBIOS
Non-volatile; 2
MB
N/A N/A GFX card video
BIOS code
Programmed at
factory
Utility required to write
data to this memory,
softpaq tool on HP
website.
Controller
(NIC) EEPROM
Non-volatile;
N/A
N/A N/A Stores config data
and MAC address
Programmed at
factory
Utility required but
limited to factory and
write in times
SODIMM
memory SPD
Non-volatile;
N/A
N/A N/A Stores memory
module
information
DIMM SPD
programmed by
memory vendor
Data cannot be
modified
Peripheral
SSD/HDD
Non-volatile;
user
configurable
Yes Yes Store OS image
and user data
By user behavior User accessible
Fingerprint
reader
Non-volatile;
N/A
N/A N/A Controller FW Programmed at
factory
Utility required but
limited to factory
Touchpad Non-volatile;
N/A
No Yes Controller FW Programmed at
factory
Utility required but
limited to factory
Touch screen Non-volatile;
N/A
No No Controller FW Programmed at
factory
Utility required but
limited to factory
Nonvolatile memory usage 187
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