Windows 7 Forums

Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: CMOS Data

03 Aug 2010   #1
Wheels of fire

Windows 7 64 Bit
 
 
CMOS Data

Why isn't CMOS data held in flash ram these days ?


My System SpecsSystem Spec
.
03 Aug 2010   #2
Dzomlija

Windows 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by Wheels of fire View Post
Why isn't CMOS data held in flash ram these days ?
It is, but not the same kind of flash ram as used in USB thumb drives.

USB thumb drive use a non-volatile technology that requires power to read/write, but the state of the bits stored is not lost when power is removed.

CMOS chips use a type of volatile memory that loses it memory when power is lost. The state of the CMOS memory is maintained using a small battery, so that settings and such are not lost when the computer is powered down. This is necessary because it allows for CMOS memory to be cleared on-demand by using a jumper or switch (effectively terminating power).

If the CMOS used the same type of flash memory as USB drives, and the memory became corrupted, or the system is unbootable because of incorrect settings, there would be now way of resetting it back to factory defaults without pysically replacing the memory chips.

Also, is there a reason why you're asking this? I'm going to go out on a limb here, as guess that whenever you power up your computer, you get a message similar to "CMOS Settings Bad", or "CMOS Date/Time Bad". If this is the case, then the battery that maintains your cmos settings is dead or dying, and needs to be replaced. Go to your nearest computer repair shop for more information on replacing the battery. Worst case senario is you will need to replace the entire motherboard...
My System SpecsSystem Spec
03 Aug 2010   #3
Wheels of fire

Windows 7 64 Bit
 
 

No problem with my PC. I just thought it would be nice to store the settings in flash instead of low power CMOS and get rid of the battery but as you say it could be tricky to clear in an emergency.
My System SpecsSystem Spec
.

Reply

 CMOS Data




Thread Tools




Similar help and support threads
Thread Forum
CMOS Bad Checksum
When I restart my computer it always goes to a screen that says CMOS BAD CHECKSUM then I press F1 to start the computer. I have to update my date and time and then everything seems to work fine. But when I click the arrow on the right side of my toolbar it just shows white spaces and I cant use...
General Discussion
CMOS Error
My pc is showing cmos error from last 2 days , and after it starts it shows the date 1 january 2010 and time 12:00 . I have also replaced the cmos battery thrice , but it drained after 1 or 2 months . please help :cry: i have gigabyte motherboard ..
General Discussion
How do I reset my CMOS ?
Hi, Plz help me to reset my CMOS... Seems my CMOS data corrupted... Sometimes, I can't able to get into BIOS setup, as there is no option seen in the screen to enter by pressing DEL (I have a Gigabyte MB).. After couple of restarts, my MB showing me as normal that (Press DEL to enter setup).....
General Discussion
Lost my CMOS battery
I've lost my CMOS battery for my sisters ASUS A8V-VM SE motherboard. Can i use any old clock battery or could someone tell me what type/ voltage etc. Thanks
Hardware & Devices
Can't clear CMOS
Yesterday I was, foolishly, messing around in BIOS. I changed the Primary Video Adapter from PCI to onboard, don't ask me why. Next I found that my screen went black. No information from the computer is received through the cabel even though the computer is powered on. I have tried resetting CMOS...
Performance & Maintenance
CMOS Error
My secondary rig keeps showing a CMOS error on boot, but only if it has been shutdown. On a restart or at desktop, there is no problem, and SpeedFan shows the Vbat at 3.10v, which is normally sufficient to indicate that the battery is okay. If I understand, the PS provides current to maintain...
Hardware & Devices


Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 04:09.

Twitter Facebook Google+



Windows 7 Forums

Seven Forums Android App Seven Forums IOS App