HP EliteBook 735 Maintenance and Service Guide - Page 108
Nonvolatile memory usage, Hard Drive Utilities, Utilities, Disk Sanitizer
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c. Select Hard Drive Utilities. 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 Table 13-1 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 How is data entered into this How is this memory memory? memory? write-protected? HP Sure Start flash 8 MB (select models only) No Yes Provides Data cannot be written to this This memory is protected protected device via the host processor. by the HP Sure Start backup of The content is managed Embedded Controller. critical System solely by the HP Sure Start BIOS code, EC Embedded Controller. firmware, and critical computer configuration data for select platforms that support HP Sure Start. For more information, see Using HP Sure Start (select models only) on page 101. Real Time Clock 256 bytes No Yes Stores system RTC battery backed-up CMOS This memory is not write- (RTC) battery date and time is programmed using protected. backed-up CMOS and noncritical Computer Setup (BIOS), or by configuration data. changing the Microsoft® memory Windows date & time. Controller (NIC) 64 KB (not No Yes Stores NIC NIC EEPROM is programmed A utility must be used to EEPROM customer configuration using a utility from the NIC write data to this memory accessible) and NIC vendor that can be run from and is available from the firmware. DOS. NIC vendor. Writing data to this ROM in an inappropriate manner will render the NIC non- functional. DIMM Serial 256 bytes per No Yes Stores memory DIMM SPD is programmed by Data cannot be written to Presence Detect memory module the memory vendor. this memory when the (SPD) module, 128 information. module is installed in a configuration data bytes computer. The specific programmable write-protection method (not customer varies by memory vendor. accessible) 98 Chapter 13 Statement of memory volatility