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DISTRIBUTION OF CLOCK INDICIA FOR A QUASI-CONSTANT LINEAR-VELOCITY DISK
DISTRIBUTION OF CLOCK INDICIA FOR A QUASI-CONSTANT LINEAR-VELOCITY DISK
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机译:准恒定线速度盘的时钟指标分布
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摘要
A disk (magnetic, magneto-optical or optical) includes information-bearing tracks having prerecorded indicia, preferably tracking pads, distributed uniformly along each track for phase locking a write clock so as to write user data subsequently between the tracking pads, in the presence of random fluctuations in disk speed. The tracks are grouped into a plurality of annular zones encircling the center of the disk, wherein the ratio of the inner radius (or outer radius) of a given zone to the corresponding radius of the adjacent inner zone is a rational number, n/d, which is the same for each adjacent pair of zones. Each track within a given zone, i, has a fixed number of radially aligned tracking pads, Pi, calculated from: Pi=(n/d)i-1x(d)N-1 where i is 1 for the innermost zone and is N for the outermost zone.
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机译:磁盘(磁性,磁光或光学)包括具有预先记录的标记的信息承载磁道,最好是跟踪盘,它们沿着每个磁道均匀分布,用于锁相写时钟,以便随后在存在跟踪盘之间写入用户数据磁盘速度的随机波动。轨道被分为围绕磁盘中心的多个环形区域,其中给定区域的内半径(或外半径)与相邻内部区域的相应半径之比为有理数n / d ,这对每个相邻的区域对都是相同的。给定区域i中的每个轨道都具有固定数量的径向对齐的跟踪板Pi,其计算公式为:Pi =(n / d)i-1x(d)N-1,其中,对于最里面的区域,i为1,并且N为最外面的区域。
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