MAGNETIC ERASING
The erasing of magnetic tape is done in one of three ways. The first, and simplest, method is to place an entire reel of the tape in a strong alternating magnetic field as shown in Fig. 10.3. This leaves the tape in a somewhat unpredictable magnetic state. It is termed bulk erasing and is more useful for removing recorded information from tape.
The second method of erasing tape is to move the tape past a recording head in which there is a high-frequency alternating current, as shown in Fig. 10.4, This is termed ac erasing, and essentially neutralises the tape's magnetic properties.
The third method is to move the tape past a recording head in which there is direct current as shown in Fig. 10.5. This is termed dc erasing, and ...
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