Is there a USB "lock" available to disable a computer?

Does anyone know of a USB "Key" or dongle that would render a desktop computer 95% useless unless the key were inserted? This would not be for extreme security purposes. It would be intended for the "honest hackers".such as nosey family members and the like. Also a requirement would be the option to purchase a duplicate "key" for bank vault storage in case the original were lost. Any ideas? Manufacturers? Retailers?
Need-a-ClueRESEARCHERAsked:
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VampireofdarknessCommented:
The only one I've heard of / seen is the Fujitsu MemoryBird / SystemLock (http://uk.ts.fujitsu.com/rl/servicesupport/techsupport/software/SystemLock/SystemLock.htm), but that is specific to Fujitsu machines...I also don't think it comes with the duplicate option.

You would likely need to go for a Smart Card setup.
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JohnBusiness Consultant (Owner)Commented:
I have not heard of such a thing. Even if it existed, it would not stop someone booting the hard drive with a bootable device and getting the data from it (which is what nosey people are looking for). ... Thinkpads_User
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Need-a-ClueRESEARCHERAuthor Commented:
I had heard of a system by which BIOS caused an internal card/device to activate. The device would then look for the specific dongle and, if correct would continue booting. Maybe I'm missing something here. Highly likely.
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Need-a-ClueRESEARCHERAuthor Commented:
Thanks all. Ill keep searching.
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JohnBusiness Consultant (Owner)Commented:
Thank you. I was pleased to assist. I shall look around as well. ... Thinkpads_User
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