MPEG-1 enabled the introduction of the first generation of video coder/decoders (CODECs) proposed by MPEG. Its development came as a response to the market demand for an efficient way to store visual information. It was intended for use with digital storage media, such as: compact disk (CD), digital audio tape, magnetic hard disks, and other optic disks. By the time of the development of this standard, CD-ROMs had a playback speed of approximately 1.2 Mbits/s, and the MPEG used this rate as a reference. However, in most of the MPEG-1 applications the video bit rates range from 1 to 1.5 Mbit/s.