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Sector Obliteration Disclosure Number: IPCOM000044436D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-05

Publishing Venue


Related People

Collins, DW Siverling, MM [+details]


Sector servoed disk drives provide servo information during a portion of each sector of rotation; however, when a defective servo sector is encountered, the defect or misinformation can lead to track misregistration or even prevent the drive from coming to a ready state on that track. To overcome this problem, defective sectors are overwritten to change the failing servo sector to a missing sector which is ignored by the system to prevent interference with the processing of either servo or data information. This technique is implemented by identifying the field to be permanently obliterated and rendering the field temporarily obliterated. This temporary obliteration is required to assure that the file will remain ready on a bad track.