Abstract: A retrofitted personal computer ("PC") has an access control module attached to the rear wall of the PC. A secondary switch within the access control module is connected in series between the main switch of the PC and the power supply. An authorized user remotely controls the powering of the PC by turning "ON"-"OFF" of the secondary switch through the "ON"-"OFF" radio pre-coded transmitter. The disk drive of the PC is protected by a disk drive lock, which is interconnected with the access control module and the PC by a cable.

Abstract: A locking device (10) is inserted within the disk drive (11) of a personal computer (12) to prevent unauthorized use thereof. The locking device (10) includes a part of pivoted plates (15, 16) retained in their expanded locking position by a key-operated lock (20) carried by the plates (15, 16). Each of the plates (15, 16) carries an arresting mechanism (35) which expands within the disk drive (11), in the event that an attempt is made to remove the locking device (10), and "bites" into the adjacent guide rail (53), thereby stopping any further movement of the locking device (10) out of the disk drive (11).

Abstract: A simple and inexpensive locking device for preventing unauthorized access to a computer disk drive. The disk drive lock employs a pair of slats 10, 20 which are pivoted at a hinge 22 for jackknife folding, the slats 10, 20 both being formed with lock-holes 24, 26 spaced from the hinge 22 and alignable by unfolding the slats 10, 20 to an open position. The disk drive lock may be inserted into virtually any conventional computer disk drive. Once inserted, the slats 10, 20 may be pivoted open and a padlock 30 inserted through the aligned locking holes 24, 26 to lock the device in the open position, thereby preventing removal from the disk drive and thwarting unauthorized access.

Abstract: Locking devices (10, 10', 10") are inserted within the disk drive (11) of a personal computer ("PC") 12 to prevent unauthorized use thereof. The locking devices (10, 10', 10") include a pair of pivoted plates (15) retained in their expanded position within the disk drive (11) by means of an externally-accessible padlock (20) or its equivalent. In one embodiment, the locking device (10) has respective pairs of pins (21, 22) which sandwich the front cover (13) of the disk drive (11). In another embodiment, the locking device (10') has respective teeth (25) which frictionally engage the respective spaced-apart side rails (26) of the disk drive (11). In yet another embodiment, the locking device (10") has both pins (21, 22) and teeth (25) and is provided with a torsion spring (30) constantly biasing the plates (15) into their expanded position.