DEVICE FOR ADJUSTING TRAVELING SPEED OF TAPE MEDIUM, METHOD FOR ADJUSTING TRAVELING SPEED, AND PROGRAM FOR ADJUSTING TRAVELING SPEED

摘要

[Object] To provide a technique for optimally adjusting a transport speed of a tape medium. [Solving means] A tape drive capable of switching the transport speed of the tape medium among multilevel speeds calculates a data transfer rate from/to a host device, and selects an adjustment mode of the transport speed of the tape medium from adjustment modes consisting of a constant speed mode and a speed switch mode according to the calculated data transfer rate. The tape drive in the speed switch mode, pauses a data write or read operation to switch the transport speed of the tape medium from a first transport speed to a second transport speed, which is one-level higher than the first transport speed, at the following timings: while data is written at the first transport speed and when an available capacity of a buffer memory reaches a data volume expected to be received from the host device during the switch of the transport speed; and while data is read out at the first transport speed and when a data volume of a buffer memory reaches a data volume expected to be transmitted to the host device during the switch of the transport speed.