Non-volatile memory usage
Non Volatile | Amount | Does this | Does this | What is the | How is data input into | How is this memory |
Memory Type | (Size) | memory | memory | purpose of | this memory? | write protected? |
|
| store | retain | this |
|
|
|
| customer | data when | memory? |
|
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| data? | power is |
|
|
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| removed? |
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|
Real Time Clock | 256 Bytes | No | Yes | Stores system | Using the F10 Setup utility | This memory is not write- |
(RTC) battery |
|
|
| date and time | or changing the Microsoft® | protected. HP |
|
|
| and limited | Windows® date & time. | recommends password | |
CMOS |
|
|
| keyboard |
| protecting the F10 Setup |
configuration |
|
|
| controller data. |
| utility. |
memory (CMOS) |
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Controller (NIC) | 64 Kbytes | No | Yes | Store NIC | Using a utility from the NIC | A utility is required to |
EEPROM | (not customer |
|
| configuration | vendor that can be run from | write data to this |
| accessible) |
|
| and NIC | DOS. | memory and is available |
|
|
|
| firmware. |
| from NIC vendor. |
|
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|
| Writing data to this |
|
|
|
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| ROM in an |
|
|
|
|
|
| inappropriate manner |
|
|
|
|
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| will render the NIC non- |
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|
|
|
| functional. |
Keyboard ROM | 64 Kbytes | No | Yes | Stores | Programmed at the factory. |
| (not customer |
|
| firmware code | Code is updated when the |
| accessible) |
|
| (keyboard, | system BIOS is updated. |
|
|
|
| mouse, & |
|
|
|
|
| battery |
|
|
|
|
| management). |
|
A utility is required for writing data to this memory and is available on the HP website. Writing data to this ROM in an inappropriate manner can render the PC non- functional.
DIMM Serial | 256 Bytes | No | Yes | Stores memory | Programmed by the memory | Data cannot be written |
Presence Detect | per memory |
|
| module | vendor. | to this memory when the |
(SPD) | module, 128 |
|
| information. |
| module is installed in a |
configuration | Bytes |
|
|
|
| PC. The specific write |
data | programmabl |
|
|
|
| protection method varies |
| e (not |
|
|
|
| by memory vendor. |
| customer |
|
|
|
|
|
| accessible) |
|
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|
System BIOS | 4 to 5 | Yes | Yes | Store system | System BIOS code is |
| MBytes |
|
| BIOS code and | programmed at the factory. |
|
|
|
| PC | Code is updated when the |
|
|
|
| configuration | system BIOS is updated. |
|
|
|
| data. | Configuration data and |
|
|
|
|
| settings are input using the |
|
|
|
|
| F10 setup utility or a custom |
|
|
|
|
| utility. |
A utility is required for writing data to this memory and is available on the HP website. Writing data to this ROM in an inappropriate manner can render the PC non- functional.
154 Chapter 14 Statement of Volatility
