| 摘要 |
A system and method are disclosed for controlling text storage in a text processing system using a segmented, serial bulk storage device. A plurality of storage segments of equal length are further subdivided into portions of equal length. A typical page of text occupies more than one portion of a segment. During system operation a log or directory is built and written, in updated form, onto a portion of the storage after any text data is written onto the storage. To minimize the time in accessing the predetermined portion on which the log is stored and to minimize wear of the electromechanical accessing components, portions of more than one segment are dedicated for storage of the log and the segment nearest that on which the text data is written is utilized for storage of the updated log. The beginning of the log includes an activity count indicitive of the number of text storage operations that has taken place. The most current log is found by seeking the highest activity count. In addition to providing information relative to segments and portions on which text is stored, the log includes other characteristics to distinquish utilized portions and unused-available portions from portions that are not to be used because of hard errors thereon. Since data is read from the storage and recorded onto the storage by portions, provisions are made for writing into the memory, a number of error codes equal to the number of bytes in a portion when read errors occur in reading from the storage and during relocation for recording a number of error codes equal to a portion when the text data cannot be successfully read from the storage. Thus, the appropriate storage size is maintained for rekeying the text.
|
