Abstract: A technique for formatting a magnetic disk for a removable magnetic cartridge includes the steps of providing the magnetic disk having a top surface and a bottom surface, writing a first servo track onto the top surface, the first servo track having a portion including a first gray code, a first position burst, and a second position burst, writing a second servo track onto the top surface adjacent to the first servo track, the second servo track having a portion including a second gray code, the second position burst, and a third position burst, and writing a third servo track onto the top surface adjacent to the second servo track, the third servo track having a portion including the second gray code, the third position burst and a fourth position burst, wherein a first data track comprises the first servo track, the second servo track and the third servo track.

Abstract: A technique for reading data from a magnetic disk includes the steps of providing the magnetic disk including a cylinder having a plurality servo sectors, a plurality of data sectors, and a zone data table, the plurality of servo sectors including a first servo sector, a second servo sector, a third servo sector, a fourth servo sector, and a fifth servo sector, the zone data table including at least a nominal timing latency between the fourth servo sector and a data sector from the plurality of servo sectors, reading the first servo sector, the second servo sector, the third servo sector, and the fourth servo sector from the magnetic disk, determining a first timing deviation for the first servo sector between the first servo sector and the second servo sector, determining a second timing deviation for the second servo sector between the second servo sector and the third servo sector, predicting a predicted third timing deviation for the fourth servo sector between the fourth servo sector and the fifth servo

Abstract: A technique for determining a position of a read/write head relative to a magnetic disk includes the steps of providing the magnetic disk having a plurality of odd servo sectors and a plurality of even servo sectors, reading a first gray code pattern in an odd servo sector from the plurality of odd servo sectors on the magnetic disk, reading a second gray code pattern in an even servo sector from the plurality of even servo sectors on the magnetic disk, the even servo sector adjacent to the odd servo sector on the magnetic disk and determining the position of the read/write head only in response to the first gray code pattern and the second gray code pattern.

Abstract: A technique for authenticating a headerless-ID magnetic disk includes the steps of inserting the headerless-ID magnetic disk having a plurality of defective locations and an encrypted defect map into a removable drive unit, retrieving the encrypted defect map from the magnetic disk, storing the encrypted defect map into a memory in the removable drive unit, decrypting the encrypted defect map to form a defect map identifying the plurality of defective locations, and using the defect map in the memory to provide access to locations on the headerless-ID magnetic disk other than the plurality of defective locations.

Abstract: An apparatus for harvesting crop parts from a standing crop and leaving stripped stems in the field has a crop stripping rotor under a hood. Grain strikes the underside of the hood, and four or more piezoelectric impact detectors detect the pattern of grain strike density on the hood. Front end grain losses are found, based on the pattern of grain strikes on the underside of the hood. The hood position is adjusted by a ram in response to data measured by the detectors.

Abstract: Apparatus for harvesting required crop parts from standing crop, leaving stripped stems in the field, comprises a crop stripping rotor under a hood. A plurality of outwardly projecting crop stripping elements are mounted on the rotor and move upwardly and rearwardly as the apparatus moves forwardly into the crop. The distal tips of the elements enter the crop and move upwardly through the crop, gathering one or more crop stems. Between adjacent crop stripping elements two succeeding relief regions are provided. Gathered crop enters the first relief region and required parts are stripped by edges of the relief region. Stripped stems pass to the second relief region for easy release and in order to avoid rejecting unstripped stems from the first relief region.