| 摘要 |
This invention includes embodiments to three sub-components or aspects as follows: a) Data file format and method and retrieving data files (random access tape) b) Read Only Filter c) Drive Names A format structure for storing retrievable encoded data on a recording medium comprises a start field for indicating the start of a data file, an index field immediately following the start field for storing indexing data respecting the data file, the index field storing a sequence of one or more positions of other start fields leading in one direction from a current position on the medium toward one end of the medium, and a field immediately following the index field for storage data which forms the data file. A method for storing encoded data on a storage medium comprises the steps of locating the last file stored on the medium, retrieving the index field of the last stored file, duplicating the index field, moving to the end of the last stored file, inserting a filemark at the current position of the medium, inserting into a final leaf block a new entry containing the entry key of the new file and the current position of the medium, storing the indexing data immediately following the filemark, and storing the encoded data immediately following the indexing data.
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