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This paper describes the recording characteristics, including the performances of recording density and over-write erase ratio, in unsaturated digital magnetic recording. The effects of the medium thickness δ and the gap length gw of a write head are particularly noticed. The experimental results can be summarized as follows : (1) In general, half amplitude density D_<50> increases with decreasing write level K; however, an irregularity resulted from the gap effect of a write head appears in excessively decreased regions of K (K≲0.5). (2) The dependency of D_<50> on δ becomes less with decreasing K. The value of D_<50> in which the same value of read output is obtained is approximately independent of the medium thickness δ in the range of K≨1. The dependency of D_<50> on gw is relatively small. (3) In general, over-write erase ratio decreases with decreasing K. The value of over-write erase ratio is hardly related to the δ/gw ratio; however, if the value of δ/gw becoms as small as 0.5,for example, over-write erase ratio becomes improved.
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