I have heard, and want to know if any truth to it, that removing the cmos
battery will allow access to a laptop that was protected by a bios password??

Re: bios password security by Shenan

Shenan
Mon May 14 22:27:02 CDT 2007

mgryan wrote:
> I have heard, and want to know if any truth to it, that removing
> the cmos battery will allow access to a laptop that was protected
> by a bios password??

Well - if you remove the only source of power keeping the information stored
in the BIOS...
Yeah - it resets it. All the settings.

Although in a laptop - this is usually more difficult than a nice roomy
desktop PC.

There are also boot disks/CDs that will wipe them clean as well.

Physical access and time - in the majority of cases - is equal to full
ownership of the computer/laptop and all un-encrypted data within.

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Shenan Stanley
MS-MVP
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How To Ask Questions The Smart Way
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Re: bios password security by Me

Me
Wed May 16 07:50:55 CDT 2007

Shenan Stanley wrote:
> mgryan wrote:
>> I have heard, and want to know if any truth to it, that removing
>> the cmos battery will allow access to a laptop that was protected
>> by a bios password??
>
> Well - if you remove the only source of power keeping the information stored
> in the BIOS...
> Yeah - it resets it. All the settings.
>
> Although in a laptop - this is usually more difficult than a nice roomy
> desktop PC.
>
> There are also boot disks/CDs that will wipe them clean as well.
>
> Physical access and time - in the majority of cases - is equal to full
> ownership of the computer/laptop and all un-encrypted data within.

Not strictly true. Older laptops could have their CMOS passwords removed
by battery removal but modern laptops store the password in EEprom
memory therefore removal of the battery will cause the laptop to lose
all it's settings, date, time, etc and maybe even prevent booting but it
will NOT clear the password.

That said, it is quite correct that there are bootable FDDs/ CDs that
will assist in password recovery/ password removal. It is also true that
physical access and time = full ownership - even if the HDD is removed
and duplicated.

HTH,

Bogwitch.

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