| 摘要 |
PURPOSE:To make it hard to forge or modify by selecting plural magnetic head in any order that a user desires at the tie of recording and selecting the magnetic heads in the recording order at the time of reproduction. CONSTITUTION:The switching order of gaps G1 and G2 is previously programmed, and data is selected as the program commands and it is recorded. Data is read in the same order as in recording by switching the gaps G1 and G2. here data blocks D1, D3, D4...Dn are recorded by a magnetically recording magnetic head H1 having the skew angle gap G1, and they can be read out only by a magnetic reproduction head with the skew angle G1. Data blocks D2, D5... are recorded by a magnetic head H2 having the skew angle G2, and read out by the magnetic head H2 having the skew angle G2. The data that each head has read out is put together to attain all read-out data.
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