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Audio Cassette "Holes”
On the spine of an audiocassette, you’re likely to see as many as six holes or covered holes :
This is what they mean:
This is what they mean:
- The ones to the far left and to the far right are the "record holes." Punching out the plastic tab covering the holes will prevent accidental erasure. On new blank audiocassettes, these two holes will usually be covered. On prerecorded audiocassettes, these holes will usually be exposed (punched out), to prevent the user from inadvertently erasing the tape.
- The next two holes, just to the right and left of the record holes (towards the center), are called the “Chrome Notch.” If those holes are exposed (punched out), the audiocassette is defined as ”Chrome (Cr02)” (sometimes referred to as “High Bias,” “High Position” or “Type II”). If those holes are covered, the audiocassette is likely to be a “Normal Bias” (sometimes referred to as “Voice Grade”, “Low Noise” or “Type I”) cassette.
- If there are two holes in the direct center of the audiocassette spine, they are called the “Metal Notch." If those holes are exposed (punched out), this is a “Metal Bias” (Type IV) audiocassette.
