Computer and accessories
Image Source: ArnoldReinhold / wikipedia under CC BY-SA 3.0
The IBM 350 was published in 1956 and is regarded as the world's first hard disk. It is made out of dozens aluminium plates, which rotate at a speed of 1200 revolutions per minute and which can save up to 5 Megabytes. Until the end of the sixties, the IBM 350 was rented for a monthly fee of 350 US dollars.