Dysan Corporation

Other

Richard L Kelly

Bradley D Baker

George E Meacham

Portable disk drive alignment tester

A method and apparatus for checking performance and alignment of a disk drive designed for use with a floppy disk having a motor driven linear positioning mechanism for locating the read/write transducer over the diskette circular tracks. A digitally prerecorded diagnostic diskette has a series of precisely located special diagnostic tracks providing reference data for various alignment and response characteristics, both mechanical and electronic. A first group of tracks have sector ID blocks followed by progressively offset data blocks interspersed therein, with the range of the offset greater than the width of the track for which the disk drive is designed, which guarantees a read failure upon reading any track. These tracks are distributed radially across the surface of the diskette at positions corresponding to each rotational phase position of the transducer stepper motor. A pair of indexed timing tracks having a fixed number of byte transitions permits testing of both the alignment of the index transducer and skew of the linear positioning device. A pair of special timing tracks affords reference data for head compliance measurement. A plurality of alternate offset tracks located centrally of the recording band provides reference data for measuring the eccentricity of the drive spindle.

Method and apparatus for disk drive alignment

An article of manufacture to eliminate ease of destruction of a slotted hasp and/or staple combination utilized to lock a door, secured together by a padlock, whereby unauthorized entry is prevented. The inventive subject matter includes a pair of spaced rigid members in secured relationship to each other, with each having an aperture placeable in contiguity and alignment with the pocket or cavity of the staple which displaces the void or spacing between the secured members. One species of the invention includes a horizontally-disposed segment at its rear end and which maintains in spaced position the members to each other, the members terminating at their other ends or faces in an open manner in order for a slip-on connection to the staple after the hasp's slot is in placed or closed upon the staple. With such connection, the rear end abuts the staple's bow while the configuration of the guard's faces at its open end cooperates with the form of the hasp. After such slip-on connection, the lock is mounted through the guard's apertures and staple's pocket and thence locked. A snug fitting among staple, hasp, guard, and lock results thereby preventing a cutting tool's work surfaces to engage the soft metal of hasp and/or staple to cut them. The guard may be heat-treated to eliminate soft metal characteristics therein, and thereby be not subject to ordinary modes of soft-metal cutting. Other species of the claimed invention are also shown.

Growing community of inventors

Santa Clara, CA, United States of America

Richard L Kelly