Hard disk password security system
Patent 5375243 Issued on December 20, 1994. Estimated Expiration Date: 
March 7, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 7, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3890601 Computer with improved keyboard password functions Power-on password functions for computer system Hard drive security system Keyboard password lock Keyboard activated screen blanking Patent #: 5173940 Inventors
AssigneeApplicationNo. 208052 filed on 03/07/1994US Classes:380/52, Including particular structure or housing (e.g., display, keyboard)711/112, Direct access storage device (DASD)711/164, With password or key713/183, Solely password entry (no record or token)713/193By stored data protectionExaminersPrimary: Chan, Eddie P.Attorney, Agent or FirmInternational ClassesG06F 012/00H04L 009/32 AbstractA hard drive which prevents data access operations on the hard drive upon power up until the user enters a password. When the computer system is powered up, the hard drive spins up and is tested, responding only to a limited set of commands that do not permit data storage or retrieval operations. The password is located on the hard disk itself to prevent bypassing the hard drive's security using a new computer environment. When the user enters the correct password, the hard drive unlocks and operates as a conventional hard drive. If the user chooses, the hard drive may be unlocked by either of two passwords, one defined by the user and the other by the manufacturer. To obtain access to data areas during a locked state, a wipe data command is provided which overwrites all user data on the drive and unlocks the drive.Other References
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