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Skewed Format Method for Personal Computer Hard Disks to Reduce Rotational Latency Delays Disclosure Number: IPCOM000061846D
Original Publication Date: 1986-Sep-01
Included in the Prior Art Database: 2005-Mar-09

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Levy, L [+details]


This article describes a skewed format method for personal computer (PC) hard disks to reduce rotational latency delays. More specifically, this article proposes that the sectors on a disk drive be angularly displaced from cylinder to cylinder to compensate for cylinder stepping time. The suggested angular displacement would be such that the disk would rotate to segment zero during the time it took to step one cylinder. A large amount of time involved in reading or writing hard disk files on a personal computer system is spent in rotational latency, which, for example, on a small PC-type hard disk is 16.67 ms /rotation. In systems such as many of the PC type, small systems around the sectors are arranged with a logical interleave starting with sector O at the index.