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1. 发明授权

US5844911A Disc storage system with spare sectors dispersed at a regular interval around a data track to reduced access latency 失效
标题翻译：具有备用扇区的盘存储系统以规则的间隔围绕数据轨道分散以减少访问延迟
公开(公告)号：US5844911A
公开(公告)日：1998-12-01
申请号：US761993
申请日：1996-12-12
申请人： John Schadegg , Neal Glover , Laura Droege Shellhamer , William L. Witt , Richard T. Behrens
发明人： John Schadegg , Neal Glover , Laura Droege Shellhamer , William L. Witt , Richard T. Behrens
IPC分类号： G11B7/007 , G11B20/18 , G01R31/28 , G11B7/00
CPC分类号： G11B20/1883 , G11B2220/20 , G11B7/007
摘要： A defect management system is disclosed for disc storage systems which avoids the access latency associated with conventional linear replacement techniques by dispersing spare segments throughout each track at a regular interval and buffering sectors inbetween a defective sector and the corresponding spare segment during read and write operations. In one embodiment, a spare segment is an entire sector which replaces a defective data sector; and in an alternative embodiment, a spare segment stores only the defective portion of a data sector which is more efficient, but also more complicated in implementation. In both embodiments, the defect management system comprises a defect locator for locating a defective segment within a data sector. Once located, the defect management system maps the defective sector (or the defective portion thereof) to the nearest available spare segment. Then when accessing the track that comprises the defective sector, the data sectors between the defective segment and corresponding spare segment are buffered in a data buffer, and an area in the data buffer is reserved for storing the data associated with the spare segment. In this manner, data can be written to and read from the track in a contiguous sequence without requiring an extra revolution of latency as in the conventional linear replacement defect mapping techniques.
摘要翻译：公开了一种用于盘存储系统的缺陷管理系统，其避免了与常规线性替换技术相关联的访问延迟，通过以常规间隔分散每个磁道上的备用段，并在读写操作期间缓冲缺陷扇区与相应备用段之间的扇区。在一个实施例中，备用段是替换有缺陷的数据扇区的整个扇区; 并且在替代实施例中，备用段仅存储更有效的数据扇区的缺陷部分，而且在实现中更复杂。在两个实施例中，缺陷管理系统包括用于定位数据扇区内的缺陷段的缺陷定位器。一旦定位，缺陷管理系统将缺陷扇区（或其缺陷部分）映射到最近的可用备用段。然后，当访问包括缺陷扇区的轨迹时，将缺陷段与相应的备用段之间的数据扇区缓冲在数据缓冲器中，并且数据缓冲区中的区域被保留用于存储与备用段相关联的数据。以这种方式，可以以连续的顺序将数据写入轨道并从轨道读取数据，而不需要象传统的线性替换缺陷映射技术那样的等待时间的额外旋转。

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