IBM Journal of Research and Development
IBM Skip to main content
  Home     Products & services     Support & downloads     My account  

  Select a country  
Journals Home  
  Systems Journal  
Journal of Research
and Development
    Current Issue  
    Recent Issues  
    Papers in Progress  
    Recent publications  
    Author's Guide  
  Contact Us  
  Related links:  
     IBM Research  

IBM Journal of Research and Development  
Volume 25, Number 5, Page 677 (1981)
25th Anniversary Issue
  Full article: arrowPDF   arrowCopyright info


A Quarter Century of Disk File Innovation

by J. M. Harker, D. W. Brede, R. E. Pattison, G. R. Santana, L. G. Taft
This paper traces the development of disk file technology from the first disk drive to the present. A number of innovative advances are reviewed in the evolution of mechanical design, materials, and processes. These advances constitute the technological base that has permitted almost four orders of magnitude of improvement in areal density; they are discussed from four interrelated aspects: the magnetic head and its air bearing support; the head positioning actuator; the disk substrate and its magnetic coating; and the read/write signal detection and clocking electronics.
Related Subjects: Magnetic head-disk interaction; Storage (computer) devices and systems