- Brand: TDK - Model Name: AD-S - Tape Length: 60 - Type: Normal - Features: Low noise, high output, extended high frequencies This is the TDK normal position (Type I) cassette tape "AD-S 60". TDK has been gradually withdrawing from the production of cassette tapes since 1997. The "AD-S 60" is a 60-minute tape from the AD series, characterized by high sound quality and low noise.