HP Pro Tower 400 G9 PCI Desktop PC Maintenance and Service Guide - Page 113
Statement of memory volatility, Table 11-1
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Table 11-1 Troubleshooting steps for nonvolatile memory usage (continued) Nonvolatile memory type configuration data Amount (Size) Does this memory store customer data? programmable (not customer accessible) Does this memory retain data when power is removed? What is the How is data entered into purpose of this memory? this memory? How is this memory write-protected? The specific writeprotection method varies by memory vendor. System BIOS 9 MB Yes Yes Stores system System BIOS code is NOTE: Writing data BIOS code and programmed at the to this ROM in an computer factory. Code is updated inappropriate manner configuration when the system BIOS can render the data. is updated. Configuration computer data and settings are nonfunctional. entered using the Computer Setup (BIOS) or A utility must be used a custom utility. for writing data to this memory and is available on the HP website; go to http://www.hp.com/ support. Select Find your product, and then follow the on-screen instructions. Intel 1.5 MB or 7 MB Yes Yes Stores Management Engine Code The Intel chipset is Management Management is programmed at the configured to enforce Engine Engine Code, factory. Code is updated hardware protection to Firmware Settings, via Intel secure firmware block all direct read- (present only in Provisioning update utility. Unique write access to this select Elite or Z Data and Provisioning Data can be area. An Intel utility models. For iAMT third- entered at the factory must be used for more party data or by an administrator updating the firmware. information, go store. using the Management Only firmware updates to Engine (MEBx) setup digitally signed by Intel http://www.hp.com/support. Select utility. The third-party can be applied using Identify your data store contents can this utility. product for be populated by a remote manuals and management console or specific product local applications that information, have been registered by and then follow an administrator to have the on-screen access to the space. instructions.) Bluetooth flash 2 megabits No Yes Stores Bluetooth flash is A utility must be used (select products Bluetooth programmed at the for writing data to this only) configuration factory. Tools for writing memory and is made and firmware. data to this memory are available through not publicly available but newer versions of can be obtained from the the driver whenever silicon vendor. the flash requires an upgrade. 802.11 WLAN 4 kilobits to 8 No Yes Stores 802.11 WLAN EEPROM A utility must be used EEPROM kilobits configuration is programmed at the for writing data to and factory. Tools for writing this memory and is calibration data to this memory are typically not made data. not made public. available to the public unless a firmware upgrade is necessary 106 Chapter 11 Statement of memory volatility