The good news is that, as you’ve seen, they typically last for years. It serves an important function, even though it’s actually possible on most machines to run without enable or disable onboard USB, IEEE1394, audio.Actually all PCs, desktop and laptop alike, have a battery like this, typically referred to as the “CMOS” battery.enable or disable the CPU internal cache.activate or deactivate the quick power-on self-test (POST).change the boot sequence/order (To install operating system).There are a few common things which you can do in almost all BIOS systems: These changes instruct the hardware to function as per the new settings. After modification and saving, the computer will restart with the respected changes. You can change these settings as per your need and requirement. BIOS utilityīIOS hardware configuration has a lot of setting options. Your computer will then restart with the new settings. After making necessary changes, save the setting by pressing F10 Key (or any other key as shown in your BIOS setup) and exit the BIOS setup utility.ĥ. You can see these keys on the screen on the downside or right hand side.Ĥ.
There could be different keys in different motherboards for changing the values of boot sequence. To set the boot sequence of any bootable media on first priority like CD or DVD or HDD or USB over any drive, move it to the first position.ģ. The life of a CMOS battery is approximately 10 years before it requires replacement.īIOS setup utility for chipset configurationĢ. This is due to a separate power source of CMOS known as CMOS battery.ĬMOS Battery: This is a dedicated power source via a Lithium-ion whose size is equal to a coin. It is capable of storing data even if powered off from computer. They may be present in a few motherboards. They store the information like disk drives installed, date and time of system, and booting sequence of our system. They can store data of a small size like 256 bytes. Basically these changes are stored in another special chip memory known as CMOS.Īlmost all chips like RAM and others (whichever store the BIOS setting) are manufactured in the same way as CMOS chips are manufactured.
CMOSĪs you modify the setting in BIOS configuration, the changes you have made are not stored in the chip of the BIOS.
It enables to see the BIOS interface or change its setting accordingly. You can see a message like ‘ Press F2 for setup’ as you start your computer. After that, the operating system gets loaded on the computer memory.īIOS creates an environment for configuring our computer hardware. After that, it searches the boot loader and executes it. The BIOS performs the POST (power-on self-test), which initializes and tests the computer’s hardware.
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