Method of reading digital data on magnetic tape
    4.
    发明授权
    Method of reading digital data on magnetic tape 失效
    在磁带上读取数字数据的方法

    公开(公告)号:US5251077A

    公开(公告)日:1993-10-05

    申请号:US715085

    申请日:1991-06-11

    申请人: Shuichi Saitoh

    发明人: Shuichi Saitoh

    IPC分类号: G11B5/09 G11B20/18 G11B20/12

    CPC分类号: G11B20/18 G11B20/1833

    摘要: A reading method for a magnetic tape having a series of frames each constituted of a predetermined number of data blocks. For reading any given frame of the tape more quickly than heretofore in the face of a possible read error or errors, there is employed a buffer memory capable of temporarily storing the data from one complete frame preparatory to delivery to a host system. As the succesive blocks of the frame are read by an electromagnetic transducer, the data from each block is checked for an error by a check signal read from that block, and the data from only those blocks where no read error has been found are written on the buffer memory. Then, in event a read error has been found on more than a predetermined number (e.g. one) of blocks, all the blocks of the same frame are reread. During this rereading, the data from only those blocks where a read error has been found during the initial reading are checked for an error and written on the buffer memory if no error has been found. The rereading of the same frame may be repeated up to a predetermined number of times until a read error becomes found on not more than the predetermined number of blocks.

    摘要翻译: 一种具有一系列帧的磁带的读取方法,每个帧由预定数量的数据块构成。 为了在面对可能的读取错误或错误的情况下比以前更快速地读取磁带的任何给定帧,使用缓冲存储器,其能够临时存储从一个完整的帧准备到传送到主机系统的数据。 由于电磁换能器读取帧的连续块,通过从该块读取的检查信号来检查来自每个块的数据的错误,并且只有那些没有发现读取错误的块的数据被写入 缓冲存储器。 然后,如果在超过预定数量(例如一个)块的情况下发现读取错误,则重新读取同一帧的所有块。 在这种重读期间,仅在那些在初始读取期间发现读取错误的块的数据被检查错误,并且如果没有发现错误则被写入缓冲存储器。 可以重复相同帧的重读直到预定次数,直到在不超过预定数量的块的情况下发现读取错误。