A cartridge contains: a tape-shaped magnetic recording medium; a communication unit communicating with a recording / restoring apparatus; a storage unit; and a control unit that stores information received from the recording / restoring apparatus via the communication unit in the storage unit, reads the information from the storage unit according to a request from the recording / restoring apparatus, and sends the information via the communication unit to the Sending recording / recovery device. The information includes adjustment information for adjusting a tension applied to the magnetic recording medium in a longitudinal direction thereof. The magnetic recording medium has an average thickness t satisfying t 5.5 [µm] and an amount of change Δw in dimension satisfying 650 [ppm / N] Δw in a width direction thereof with respect to a tension change of the magnetic recording medium in the longitudinal direction thereof.
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