Magnetic tape control system and magnetic tape control device

A magnetic tape control device comprising:

• a rewinding control unit configured to transmit rewinding execution information;
• and
• a drive unit configured to receive the rewinding execution information and starts running of a magnetic tape stored in a state of being wound around a reel, to execute rewinding of the magnetic tape,
• wherein the rewinding is winding the magnetic tape around a reel different from or the same reel as the reel around which the magnetic tape is wound before the rewinding such that an end that is a tape outside end before the rewinding is turned into a tape inside end and an end that is a tape inside end before the rewinding is turned into a tape outside end;
• the rewinding control unit is configured to determine a transmission time of the rewinding execution information based on a comparison result of comparing a measurement result regarding a tape width of the magnetic tape that was stored in a state of being wound around the reel before the rewinding with a measurement result regarding a tape width of the magnetic tape before being stored in a state of being wound around the reel;
• the measurement result regarding a tape width of the magnetic tape before being stored in a state of being wound around the reel being a measurement result of a Measurement 1 which is performed after data is recorded on the magnetic tape and before being stored in a state of being wound around the reel;
• the measurement result regarding a tape width of the magnetic tape that was stored in a state of being wound around the reel before the rewinding is a measurement result of a Measurement 2 which is performed to the magnetic tape that was stored in a state of being wound around the reel for a given period before the rewinding, with no data being recorded on the magnetic tape during said Measurement 2;
• and
• the measurement results regarding the tape width of the magnetic tape obtained by Measurements 1 and 2 being selected from the group consisting of measured values obtained by measuring the tape width of the magnetic tape and measured values obtained by measuring an interval of two adjacent servo bands with a data band interposed therebetween on the magnetic tape.