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AssigneeInternational Business Machines Corporation
InventorsMario Blaum, Steven R. Hetzler, William John Kabelac
Estimating the term…
A magnetic recording disk drive has head positioning servo sectors with servo sector numbers (SSNs) that are not recorded on the disk. The SSNs are encoded through the use of multiple servo sector types that are arranged in a specific sequence around the data tracks. The different servo sector types are identified by unique types of servo timing marks (STMs), which are used to locate the servo sectors. The SSNs that are used to identify the servo sectors on the track form a set or code of m fixed n-bit patterns. A SSN is determined when the STM types read from n sequential servo sectors match one of the fixed SSN pattems. A set or code of m servo sectors, where each servo sector is identified by a unique SSN pattern having length n, is denoted as an (m,n,d) code, where d is referred to as the minimum Hamming distance of the code. The Hamming distance between two patterns refers to the number of locations that are different between the two pattems.
A data recording disk drive that has a recording disk and a transducer that reads information from or writes information to the disk, the disk drive comprising:
A data recording disk for use in a disk drive having a recording transducer for reading or writing data to the disk, the disk having a plurality of generally circular tracks, each of the plurality of tracks having a plurality of data sectors for user data and m angularly spaced servo sectors containing transducer positioning servo information, each of the m servo sectors being one of a plurality of p unique servo types, where p is less than m, wherein sequences of sector types from sets of n angularly adjacent servo sectors form m patterns that uniquely identify the m servo sectors on the track, and wherein each of the m servo sector number patterns of n bits has a sliding distance d to every other of the m servo sector number patterns, where the sliding distance d determines the error correction capability.
Data recording media having a plurality of data tracks, each of the plurality of tracks having m data sectors for user data, each of the m data sectors containing a value representative of one of a plurality of p unique data sector types, where p is less than m, wherein sequences of data sector type values from sets of n adjacent data sectors form m patterns of n-bits each that uniquely identify the m data sectors on the track, and wherein each of the m data sector patterns of n bits has a sliding distance d to every other of the m data sector patterns, where the sliding distance d determines the error correction capability.
Dependencies are inferred from the claim text.