The space between pole pieces in a head.Head, erase — The head that is used to apply a gradually diminishing magnetic force to the tape, thus erasing it just prior to recording.
"You did a fabulous job! Last week, I sent you an ancient original cassette tape that can't be bought any longer...and in less than 7 days I received my tape back with a great recording on CD! I've listened to the CD all day from my computer...what a fantastic job! Thanks a bunch!!"