| 摘要 |
A magnetic recording medium is provided that can ensure stable recording and reproducing characteristics with little off-track even when a track density in the direction of width of the tape is very high and 50 lines/mm or more, an off-track margin is 5 mum or smaller, and a variation that is permitted at maximum as a dimensional variation in the direction of width of the tape itself due to environmental factors such as the change of temperature and humidity, the change of tension, a creep, etc. is small as low as 0.10% or less. Assuming that Young's modulus in the direction of width of a non-magnetic substrate is lambda and Young's modulus in the direction of width of the back layer is Y, X is 850 kg/mm<SUP>2 </SUP>or more, or when X is less than 850 kg/mm<SUP>2</SUP>, XxY is 6x10<SUP>5 </SUP>or more, and assuming that Young's modulus in the direction of width of a layer including a magnetic layer is Z, Y/Z is not larger than 6.0.
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