Abstract: A disk drive system is described for forming and reading precise optically detectable patterns on rotating members of a disk and spindle assembly used in data storage system. In particular the invention describes a magnetic disk drive employing a laser system to form and sense optical clock patterns placed on the rotating members of the disk drive. These optically detectable patterns are used to create an accurate clock track. The clock may be used to create multiple accurate magnetic patterns on one or more disks attached to a disk and spindle assembly in a magnetic data storage system. By successively changing the radius at which the magnetic patterns are created it is then possible to create multiple magnetic patterns at successive radii with all such magnetic patterns having a precise geometric relationship to each other. Alternatively, the accurate clock pattern may stand alone as an encoder.

Abstract: The present invention is used to form precise, optically detectable patterns on rotating members of a disk and spindle assembly of a disk drive used in data storage system. In particular, the invention employs an optical source to form optically detectable patterns on the rotating members of the disk drive. These optically detectable patterns are used to create an accurate clock track. The clock track may be used to create multiple accurate magnetic patterns on one or more disks attached to a disk and spindle assembly in a magnetic data storage system. By successively changing the radius at which the magnetic patterns are created it is then possible to create multiple magnetic patterns at successive radii with all such magnetic patterns having a precise geometric relationship to each other. Alternatively, the accurate clock pattern may stand alone as an encoder.

Abstract: A write drive logic circuit is described. The write driver logic circuit comprises a set of write drivers, with each one of the set of write drivers having an input and an output, such that each write driver is responsive to an input signal applied to the input to provide a write output signal at the output as a function of the input signal. A set of memory devices (e.g. shift registers) is provided, one for each write driver. Each one of the shift registers stores unique head identification information and includes an output to controllably output a signal representative of the unique head identification information. Furthermore, each one of a set of multiplexers includes an output, a first input coupled to a corresponding one of the outputs of the set of shift registers to receive the signal representative of the unique identification information stored in the respective shift register and a second input coupled to a common write data line that transmits a signal representative of preselected information.

Abstract: A cord take-up reel for use on an electric lawn mower. The reel is telescopically constructed to permit its axial dimension to be adjusted for mounting between a pair of opposing mower handles. A pair of shafts extending outwardly from opposing sides of the reel are detachably and rotatably mounted in brackets held on the opposing mower handles. A crank pivotally attached to one of the reel shafts is positionable between a winding position and a stowed position, the motion of the crank in its stowed position being limited by a cradling member attached to the adjacent bracket.