a recording head in a tape recorder or disk drive that cannot be moved relative to the center of the disk, offering reduced access time.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for fixed head
Two of the fixed-head tracks are devoted to the display: they drive a hardware-translator continuously.On-Line Data-Acquisition Systems in Nuclear Physics, 1969|H. W. Fulbright et al.