Dell E Series 교육 - 페이지 23
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페이지 인쇄
The options available are essentially the same for all Dell notebooks.
BIOS Storage Location
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Since the BIOS is stored in the Programmable Read‐Only Memory (PROM) on
a CMOS chip, it is often called PROM BIOS. Isolating the BIOS from other
components makes it very difficult to accidently overwrite or lose.
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Because PROM is volatile, a small battery supplies continuous power to the
CMOS chip, ensuring that the BIOS is always available and cannot be
damaged by power or disk failures. When the battery is nearing the end of
its life, you may notice that the BIOS settings revert to the factory defaults
when the system is powered down. Date and time reversions are usually
most evident.
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PROM BIOS contains the code that allows a computer to boot.
NOTE: Many computer manufacturers design systems so that the BIOS is copied from ROM to RAM each
time the computer is booted. This is known as "shadow BIOS ROM," "Shadow Memory," and "Shadow
RAM." The objective is to allow the computer to access that information quickly.
Types of BIOS
The PROM on which the BIOS resides is electronically erasable, giving us the term electrically erasable
programmable read‐only memory (EEPROM).
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Since the BIOS is stored in EEPROM, it can be updated. Another term for a BIOS stored on an
EEPROM is Flash BIOS. Updating such a BIOS is commonly called flashing the BIOS.
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A BIOS that works with the operating system to accommodate plug‐and‐play (PnP) devices is known
as a PnP BIOS or a PnP‐aware BIOS.
CAUTION: The BIOS should never be flashed on battery power. Flashing the BIOS without sufficient
power can permanently damage the system board. The notebook power supply should always be
connected to the system before attempting to flash the BIOS.
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