公开(公告)号：US5459853A

公开(公告)日：1995-10-17

申请号：US979740

申请日：1992-11-23

申请人： John S. Best ,  Steven R. Hetzler ,  Roger F. Hoyt ,  Jaishankar M. Menon ,  Michael F. Mitoma

发明人： John S. Best ,  Steven R. Hetzler ,  Roger F. Hoyt ,  Jaishankar M. Menon ,  Michael F. Mitoma

IPC分类号： G06F3/06 ,  G06F11/10 ,  G11B20/10 ,  G11B20/12 ,  G06F12/00 ,  G06F12/04

CPC分类号： G06F11/1076 ,  G06F11/1008 ,  G06F3/0601 ,  G06F2003/0697 ,  G11B20/1258

摘要： A method for operating a synchronized array of fixed block (FBA) formatted Direct Access Storage Devices (DASDs) to store and update variable-length (CKD) formatted records. This method is suitable for use with DASDs that obtain high recording density by using read and write head technology requiring "micro-jogging" to adjust for differing read and write head alignment or banded disk architecture having a higher block count in the outer tracks than in the inner tracks. Magneto-resistive heads may require micro-jogging to realign the write head for recording after reading the physical track location. The invention employs a DASD staggered array architecture having logical tracks consisting of diagonal-major sequences of consecutive blocks arranged in a predetermined wrap-around manner such as a topological cylinder or torus. The minimum necessary number of DASDs (N) in the staggered array is limited by the fixed block size (B), the interblock gap size (G), the average DASD data transfer rate (D), and the micro-jog delay time (T). A (N+1).sup.th DASD may be added to record the parity of each diagonal-major sequence for improved fault-tolerance.

摘要翻译： 一种用于操作固定块（FBA）格式化的直接存取存储设备（DASD）的同步阵列以存储和更新可变长度（CKD）格式记录的方法。 该方法适用于通过使用需要“微点动”的读写头技术来获得高记录密度的DASD，用于调整不同的读写头对准或带外磁盘结构，在外轨道中具有较高的块数，而不是 内轨。 在读取物理轨道位置之后，磁阻头可能需要微型点动来重新对准写入头进行记录。 本发明采用具有逻辑轨迹的DASD交错阵列架构，其逻辑轨道由以诸如拓扑柱面或环面的预定绕环方式布置的连续块的对角线主序列组成。 交错阵列中DASD（N）的最小必需数量受固定块大小（B），块间间隙大小（G），平均DASD数据传输速率（D）和微点动延迟时间（D） T）。 可以添加A（N + 1）DASD来记录每个对角线主序列的奇偶校验，以提高容错能力。

公开(公告)号：US5202799A

公开(公告)日：1993-04-13

申请号：US719379

申请日：1991-06-24

申请人： Steven R. Hetzler ,  Jaishankar M. Menon ,  Michael F. Mitoma

发明人： Steven R. Hetzler ,  Jaishankar M. Menon ,  Michael F. Mitoma

IPC分类号： G06F3/06 ,  G11B19/28 ,  G11B20/10 ,  G11B20/12 ,  G11B27/00 ,  G11B27/10

CPC分类号： G06F3/0601 ,  G11B19/28 ,  G11B20/10 ,  G11B20/1258 ,  G11B27/002 ,  G11B27/10 ,  G06F2003/0697 ,  G11B2020/1257 ,  G11B2220/415

摘要： One or more data-storing disk devices support logical tracks extending between radial recording zones of tracks in the device(s). Each data-storing disk in the device(s) is formatted into a plurality of radial recording zones of physical tracks, each radial recording zone having a like number of physical tracks, each physical track may be one circumvolution of a single spiral track. The physical tracks in the respective recording zones store a different number of data bytes. Each logical track including a plurality of said physical tracks; at least one of the physical tracks in each of the logical tracks is in a different one of the radial recording zones in different ones of the devices or in a single device. Described are an extended logical track and extended logical cylinder accessing methods and apparatus. Not all of the physical tracks of any of the devices or recording zones need be a member of any logical track.