| 摘要 |
A set of tape cassettes of different sizes which each includes electric information representing terminals and which are used with a common recording and/or reproduction apparatus and a recording and/or reproduction apparatus with which those tape cassettes can be selectively used are improved in that information represented by the electric information representing terminals is read by a detection arrangement common to the tape cassettes of the different sizes. The electric information representing terminals are disposed at equal distances on the tape cassettes from corresponding outer side faces of the tape cassettes. A detection block, on which a connector for contacting with the electric information representing terminals provided on a tape cassette to read electric information and a detection switch for detecting a wrong erasure preventing element provided on the tape cassette are provided integrally, is moved, in response to a size of a tape cassette loaded in position into the recording and/or reproduction apparatus, to a position determined for the size in advance.
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