1-inch Type B (also known as B-Format) was an open reel magnetic tape format for professional analogue video recording.
It was introduced by Bosch in 1976 for use in its BCN line of video recorders and although it found success in continental Europe, 1-inch Type C was more successful in the UK and US. Unlike Type C, Type B in its standard form could not perform trick-play operations such as slow-motion or frame step play, due to the way the each field was segmented over 5 or 6 tracks (Type C recorded one frame per helical scan). An expensive digital framestore was needed to perform trick-play operations.
Type B had a standard capacity of 96 minutes on a reel, although later this was increased to 120 minutes. Long play versions eventually became available that could fit up to 6 hours on one reel.
Video quality was excellent, and as well as standard recording/playback machines, portable and random access cart machines were available.