Linear recording executing optimum writing upon receipt of series of commands including mixed read and write commands

摘要

A method is provided according to one embodiment, which executes an optimum writing method even when overwrite is intervened between mixed read and write operations. In response to receiving an overwrite command while executing the mixed operations, which writes to a predetermined tape position, when a tape position to overwrite on is encountered before the append-written data ending position of the tape (tape EOD), the overwritten tape position is regarded as the append-written data ending position of the tape (tape EOD) to update the tape EOD by the overwritten tape position. When a tape position to overwrite is encountered after the append-written data ending position of the tape (tape EOD), the overwritten tape position is updated by the append-written data ending position of a non-volatile memory (non-volatile EOD). The updating the EODs enhances the performance of the mixed read and write operations even when an overwrite command is intervening.

主权项

1. A method for writing data in a tape recording apparatus, the method comprising:
receiving a series of commands, the series of commands including mixed read, overwrite, and append write commands; reading data from a specified position of the tape using a head and storing the data in a buffer in response to a read command; and writing data stored in the buffer starting from an appended data end position of the tape in response to an append write command.