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historymemory2, random access method of accounting and control, rom, read control arm which read the disc. this was read only!, two main advances, mechanical arms which scanned each side of the disks which spun up to 1,200 rpm., 5 mb of ram, 1986, much more reliable than 305 ramac!!, ibm, cd-rw, 3 1 2 and 5 1 2 inch., 650 mb read write, portability and compactness, my birth year ), floppy disks, 305 ramac, read write arms which could finally write to cds, big advance., 100 concentric data tracks, a grid of columns and rows, connecting its lines via diodes (electronic device with two terminals) to store memory., 50, 24-inch diameter disks, first commercial disk drive, introduced in 1984, using small disks made of ferrous, magnetic material., read only memory, 1996, integrated circuit technology, 650 mb, cd-rom, newer forms of computer memory