DataPlay was an optical disk format for audio and data storage, introduced by DataPlay Inc in 2002.It used a very small 32 mm diameter disc with a capacity of 500 MB enclosed in a protective cartridge (42.1 mm × 33.5 mm × 3.0 mm).
DataPlay was used for portable music playback, and a small number of pre-recorded albums were released.
They were recordable, but only write-once like CD-R.