Re: XP and bios

<Danieltbt05@xxxxxxxxx> wrote in message
news:1122479260.734240.101140@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Does WinXP have a clock by itself ? If the computer battery ran weak,
> will it affect WinXP from booting up normally ? My machine battery was
> weak and the time was reset to previously. Windows can't booted into
> desktop and there is a message indicate time was incorrect. Pls advise.
> Thanks.

There are actually three clocks. The RTC is the only real clock, as it
maintains real time (RTC = Real Time Clock)even when power is off, via an
accumulator/battery. At bootup, the BIOS reads the RTC and begins counting
time independently of the RTC. Finally, Windows reads the BIOS clock and
begins counting time independently of both the RTC and BIOS. All three
clocks can go out of sync quite quickly (even the RTC is not that accurate).

When you change time in Windows (such as when synchronising to a time
server), both the BIOS and RTC clocks are updated accordingly.

But, if the accumulator/battery (usually a small NiCad rechargable battery)
fails to charge while power is on not only will the clock lose time
(ultimately resetting to the BIOS manufacture date/time), but you'll also
lose CMOS settings when power is switched off. Therefore take a note of them
before you lose them! You can normally expect to change your NiCad every 3
years or so, but many will last 5 years or more. It really depends how often
and for how long the PC is off (while power is on, it is simply recharging).

Replacing the battery should resolve your situation, but you can temporarily
work around it by changing the BIOS time before booting to Windows.


.

Relevant Pages

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