| 摘要 |
PURPOSE:To simplify discrimination of the recording mode by disposing a data of specific m-bits which is not used other than a specific recording mode with respect to m-bits of a specified n-bit data in an n-bit data group. CONSTITUTION:The data which does not exist in some other mode are disposed in PP1 between the zeroth - sixth bits and distinguishing information is distributed in the seventh bit. The ID2 in the track in which the PP1 is recorded varies as being Mn, Mt, Hm, Ht, etc. at each existence of the PP1, and hence all the information can be read even when the tape is running at a high speed. PPX is one to specify some other submode by using an ID3 of mode 7, in which a specific data differing from that of the PP1 is disposed. X1 of an ID2 and X2 of an ID4 are the data disposed in corresponding to the submode specified by the PPX. PPX can be made able to specify a submode to dispose a letter- character code in the ID2 and ID4. Furthermore, the PP1 and PPX are n-bit data that includes the specific m-bit data.
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