That would be a "Winchester" drive. I remember for some time, the "stack of disks" icon was used in diagram as a shorthand for "hard drive" or "permanent storag

That would be a "Winchester" drive. I remember for some time, the "stack of disks" icon was used in diagram as a shorthand for "hard drive" or "permanent storage". Not sure if that's still in use. Interesting example of how technology changes its external shape -- usually into some nondescript boxy thing, but the old designs live on as iconography. Like diskette icon as a shorthand for "Save". Or this one still going strong in Latin America: http://commons.wikimedia.org/wiki/File:Road_Sign_Peru_Prohibido_Tocar_Bocina.jpg http://commons.wikimedia.org/wiki/File:Road_Sign_Peru_Prohib... "No horn blowing" -- that would be the horn of a Ford T on that sign...