Abstract: A conductive device for protecting and securing electrical circuit substrates during manufacture and shipment which includes a plurality of spring driven pin slides anchored on a common support member, each slide securing a substrate against a corresponding substrate stop.

Abstract: The invention is a head positioning assembly (10) for use with a conventional disk drive (12). The assembly (10) is adapted to position the ready/write head (22) on a rotating diskette (21) and includes a locating disk (30) provided with a cardioid cam groove (32). A cam follower (46) rides within the cam groove (32) and thereby causes a carriage (40) to move radially between a pair of guide rods (42 and 44) to position the read/write head (22). The locating disk (30) is caused to rotate by selectively activating a solenoid (98) which causes an idler assembly (72) to contact the locating disk (32) with a moving idler belt (90). The idler belt (90) is indirectly powered by the same brushless DC motor (16) which powers the disk drive (12). A sensing subassembly (50) senses a zero position aperture (34) and a plurality of tract position apertures (36) and acts in conjunction with external circuitry (600) and the solenoid (98) to control the rotation of the locating disk (30).