Standard (Phillips) Audio Cassette:
The Compact Cassette is a magnetic tape recording format for audio recording and playback. Compact cassettes come in two forms, either already containing content as a pre-recorded cassette, or as fully recordable "blank" cassette.
Developed by: Philips
Launched on: 30 August 1963 (at the Berlin Radio Show)
Used for: home recording, music distribution. Some improved versions were used in music production and news gathering.
a.k.a.: musicassette (MC), cassette tape, audio cassette, audiocassette, tape
Tape length: The length of the tape in minutes is usually printed on the label, sometimes following the letter "C". Example: "C:60" means that the total tape duration is 60 minutes. Other common formats are C:90 and C:120.
Magnetic tape used: 3.81 mm (0.150 in) polyester type plastic film with magnetic coating (Ferric oxide, chromium dioxide, magnetite, cobalt absorbed iron oxyde, metal particle
Speed: 4.76 cm/s (1-7/8 ips). Some professional recorders use 9.5 cm/s speed
Noise reduction: Dolby B, C and DBX
Number of tracks: 4 (2 stereo, 2 directions). Some recorders use half-track heads, other record 4 linear tracks at 9 cm/s.
Magnetic tape manufacturers: numerous