Non Volatile | Amount (Size) | Does this | Does this | What is the | How is data | How is this |
Memory Type |
| memory store | memory retain | purpose of this | input into this | memory write |
|
| customer data? | data when | memory? | memory? | protected? |
|
|
| power is |
|
|
|
|
|
| removed? |
|
|
|
|
|
|
|
|
|
|
Real Time Clock | 256 Bytes | No | Yes | Stores system | Using the F10 | This memory is |
(RTC) battery |
|
|
| date and time | Setup utility or | not write- |
|
|
| and limited | changing the | protected. HP | |
configuration |
|
|
| keyboard | Microsoft | recommends |
memory (CMOS) |
|
|
| controller data. | Windows date | password |
|
|
|
|
| and time. | protecting the |
|
|
|
|
|
| F10 Setup |
|
|
|
|
|
| utility. |
|
|
|
|
|
|
|
Controller (NIC) | 64 KBytes (not | No | Yes | Store NIC | Using a utility | A utility is |
EEPROM | customer |
|
| configuration | from the NIC | required to write |
| accessible) |
|
| and NIC | vendor that can | data to this |
|
|
|
| firmware. | be run from DOS. | memory and is |
|
|
|
|
|
| available from |
|
|
|
|
|
| NIC vendor. |
|
|
|
|
|
| Writing data to |
|
|
|
|
|
| this ROM in an |
|
|
|
|
|
| inappropriate |
|
|
|
|
|
| manner will |
|
|
|
|
|
| render the NIC |
|
|
|
|
|
| nonfunctional. |
|
|
|
|
|
|
|
Keyboard ROM | 64 KBytes (not | No | Yes | Stores firmware | Programmed at | A utility is |
| customer |
|
| code (keyboard, | the factory. | required for |
| accessible) |
|
| mouse, & | Code is updated | writing data to |
|
|
|
| battery | when the system | this memory and |
|
|
|
| management). | BIOS is updated. | is available on |
|
|
|
|
|
| the HP website. |
|
|
|
|
|
| Writing data to |
|
|
|
|
|
| this ROM in an |
|
|
|
|
|
| inappropriate |
|
|
|
|
|
| manner can |
|
|
|
|
|
| render the PC |
|
|
|
|
|
| nonfunctional. |
|
|
|
|
|
|
|
DIMM Serial | 256 Bytes per | No | Yes | Stores memory | Programmed by | Data cannot be |
Presence Detect | memory |
|
| module | the memory | written to this |
(SPD) | module, 128 |
|
| information. | vendor. | memory when |
configuration | Bytes |
|
|
|
| the module is |
data | programmable |
|
|
|
| installed in a PC. |
| (not customer |
|
|
|
| The specific |
| accessible) |
|
|
|
| write protection |
|
|
|
|
|
| method varies |
|
|
|
|
|
| by memory |
|
|
|
|
|
| vendor. |
|
|
|
|
|
|
|
System BIOS | 4 to 5 MBytes | Yes | Yes | Store system | System BIOS | A utility is |
|
|
|
| BIOS code and | code is | required for |
|
|
|
| PC configuration | programmed at | writing data to |
|
|
|
| data. | the factory. | this memory and |
|
|
|
|
| Code is updated | is available on |
|
|
|
|
| when the system | the HP website. |
|
|
|
|
| BIOS is updated. | Writing data to |
|
|
|
|
| Configuration | this ROM in an |
|
|
|
|
| data and | inappropriate |
|
|
|
|
| settings are | manner can |
102 Chapter 10 Statement of Volatility