Hard drive key?

Hello,
I have recently heard about a device that, I think goes between the IDE cable and the hard drive that will set the computer image back to it's original state after a reboot.  Can you tell me exactly what this device is (a name)?

Thank you!!!

SCUD1
SCUD1Asked:
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star57techConnect With a Mentor Commented:
The centurian , Its great for a library.
http://www.centuriontech.com/centurionguard.htm

Kieth
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WadskiIT DirectorCommented:
You can get them from ebay very cheap
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reedsrCommented:
there are devices called re-born cards that also do this same type of thing, they use them in university computer labs
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