the holes on the top of the cassette will indicate what kind of tape it is.
normal - holes next to the 'safety punch tabs' at the far ends.
CrO2 - are about 3/4 inch from the edges
Metal - almost together in the center.
grab a cassette of each know type and match up the top holes with your mystery tape to verify.
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Bias is a special signal that is applied during recording. The first tape recorders simply applied the raw audio signal to the electromagnet in the head. This works, but produces a lot of distortion on low-frequency sounds. A bias signal is a 100-kilohertz signal that is added to the audio signal. The bias moves the signal being recorded up into the "linear portion" of the tape's magnetization curve. This movement means that the tape reproduces the sound recorded on it more faithfully.
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