The reason this seems so confusing is because there are many names for the exact same thing. Lay a piece of 1/4" tape flat on the table and imagine it cut into 4 equal sections numbered 1-4. For a home stereo recorder/player (like the A-1250S) section #1 is the left channel of side 1. Section #3 is the right channel of side 1. Now lets flip the tape over...section #2 becomes the left channel of side 2 of the tape, and section #4 is now the right channel of side 2. This is called 1/4 track stereo (because the tape is cut into quarters). It is sometimes refered to as 4 track stereo, but IMHO 1/4 track stereo is a more accurate description. For studio mixdown use, a two track system is used whereby the left channel is recored on tracks 1 and 2, and the right side is recorded on tracks 3 and 4. These machines usually say "2 track" on the front to idicate the 2 track head block option. Then we have the 4 track single direction models that will record all 4 sections of our tape that is cut up on the table in front of us (remember the tape?) in the same direction at once. These machines have 4 vu meters and 4 controls for record and playback (like TEAC 2340 for example). There are macines that will record 8 channels in one direction on one side of the 1/4" tape like the Fostex R-8, but that's another story. Older mono machines (and the portables popular in the late sixties) typically use half track mono, where the entire upper half is side one and the entire lower half is side two. When these are played on a 1/4 track stereo machine, the right channel will play side two backwards because the half track machine has recorded the entire half of the tape in one direction...ditto for side two of the tape. Some machines (such as some Nagra and Uher field recorders used in research) use full track mono, meaning that you can only record in mono on one side of the tape only. Flipping the tape over will erase it and record the full width of the tape on side two. These recorders were available with all types of headblock options for all types of configurations including 1/4 track stereo, 2 track stereo, 1/2 track mono and full track mono.
So...we have 1/4 track stereo(probably the most common), 2 track stereo (typically for professional use), 4 track one direction (typically for home studio use and quad setups) 1/2 track mono (older mono machines and portables) and full track mono (feild research applications). There are lots of different names for these configurations, but that's how they're laid out. Confusing?:scratch2: