| 摘要 |
A magnetic disk medium having on a support a magnetic layer containing hexagonal ferrite powder dispersed in a binder, with the support having a thickness of 20 mum to 80 mum and the magnetic disk medium having an inside diameter X of 2 mm to 10 mm, an outside diameter Y of 20 mm to 50 mm, an X/Y ratio satisfying the relation 0.05<=X/Y<=0.20 and a curl quantity of 1 mm or below, which is suitable for use in small-diameter portable computer equipment and video recorders, and besides, can attain a recording capacity of at least several hundred megabytes.
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