A personal computer having a security function, a security method therefor, and methods of installing and detaching a security device are provided. The personal computer includes: an input portion for inputting a password and a user's command to the personal computer; a hard disk having a boot sector...http://www.google.de/patents/US5878210?utm_source=gb-gplus-sharePatent US5878210 - Personal computer having a security function, a method of implementing the security function, and methods of installing and detaching a security device to/from a computer
