Bill Fairchild wrote:
IBM officially called it a "fixed head storage" device (usually called drums) as opposed to a moving head storage device (usually called disks)
I'm too young to use these devices, however I was told what is the difference between drum and disk: Drum is ...geometrical drum, active surface is on the side, not top/bottom. Disk is thin slice of drum, the active surface is on top and bottom circles - like in longplay, or CD (with the exception to one spiral track vs concentric circle tracks). Drum was similar to Edison voice recording machine.
In both solutions it is possible to have more than one head, or fixed heads on some (all) tracks.
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