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公开(公告)号：MY118820A
公开(公告)日：2005-01-31
申请号：MYPI9800731
申请日：1998-02-20
Applicant: IBM
Inventor： KANAMARU ATSUSHI , KAKIHARA TOSHIO , KIGAMI YUHJI , SAITOH TAKAHIRO
Abstract: A DISK DRIVE AND A METHOD FOR CONTROLLING THE DISK DRIVE IN WHICH AN ADDITIONAL READ FROM A MEDIUM CAN BE PERFORMED AS NEEDED WHILE MINIMIZING THE COMMAND OVERHEAD TO THE MINIMUM. IN A DISK DRIVE DEVICE (10), EVEN IF A READ COMMAND IS ISSUED, AND ALL THE REQUIRED DATA IS STORED IN THE CACHE MEMORY SUCH THAT THE DATA TRANSFER CAN BE PERFORMED WITHOUT THE INTERVENTION OF A LOCAL MPU (16), A HIC (15) PERFORMS THE DATA TRANSFER SO AS TO LEAVE THE LAST ONE BLOCK AND WAITS FOR THE INTERVENTION OF THE LOCAL MPU (16). THE LOCAL MPU (16) PROVIDES INSTRUCTIONS TO TRANSFER THE LAST ONE BLOCK WHEN THE PREPARATION FOR THE COMMAND TERMINATION IS COMPLETED, AND IF A PLURALITY OF BLOCKS OF DATA TO BE TRANSFERRED ARE REMAINING WHEN THE LOCAL MPU (16) INSTRUCTS THE HIC (15) TO TRANSFER THE LAST ONE BLOCK, THE HIC (15) EXECUTES ALL THE DATA TRANSFER WITHOUT STOPPING THE DATA TRANSFER BEFORE THE LAST ONE BLOCK, COMPLETING THE COMMAND.FIGURE 1
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公开(公告)号：SG55374A1
公开(公告)日：1998-12-21
申请号：SG1997003416
申请日：1997-09-15
Applicant: IBM
Inventor： SAITOH TAKAHIRO , KIBASHI AKIRA , OKADA KENJI , OHZEKI HIDEKI
Abstract: A disk device and a method are described for reassigning data areas (e.g. sectors) which minimize the reduction in the data transfer rate when alternate data areas are used to replace defective areas. The disk device uses a plurality of data zones with spare areas allocated in each data zone. An alternate area is allocated (a) in the spare area within the data zone where the error occurs and (b) at an angular position offset more than a predetermined angle from a position of the data in which the error occurs. The offset angle allows the device time to seek to the alternate area, read the alternate area and seek back to the area following the defective area within a single rotation of the disk.
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