Lisa is a desktop computer developed by Apple, released on January 19, 1983. It is one of the first personal computers to present a graphical user interface (GUI) in a machine aimed at individual business users. Development of the Lisa began in 1978, and it underwent many changes during the development period before shipping at US$9,995 with a five-megabyte hard drive. The Lisa was challenged by a relatively high price, insufficient software library, unreliable Apple FileWare ("Twiggy") floppy disks, and the immediate release of the cheaper and faster Macintosh, yielding lifelong sales of only 10,000 units in two years.