HP Elite Dragonfly 13.5 Maintenance and Service Guide - Page 162
Nonvolatile memory usage, Utilities, Disk Sanitizer
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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 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 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 Data cannot be written to This memory is protected this device via the host protected by the HP backup of processor. The content is Sure Start Embedded critical managed solely by the Controller. System BIOS HP Sure Start Embedded code, EC Controller. 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 157. Real Time Clock 256 bytes No Yes Stores system RTC battery backed-up This memory is not (RTC) battery date and time CMOS is programmed write-protected. backed-up CMOS and using Computer Setup configuration noncritical (BIOS), or by changing the memory data. Windows date & time. Controller (NIC) 64 KB (not No Yes Stores NIC NIC EEPROM is A utility must be EEPROM customer configuration programmed using a used to write data to accessible) and NIC utility from the NIC vendor this memory and is firmware. that can be run from DOS. available from the NIC vendor. Writing data to this ROM in an inappropriate manner will render the NIC nonfunctional. DIMM Serial 256 bytes per No Yes Stores DIMM SPD is programmed Data cannot be written Presence Detect memory memory by the memory vendor. to this memory (SPD) module, 128 module when the module configuration bytes information. is installed in a data programmabl computer. The specific Nonvolatile memory usage 153