Later, availability of MP3 and other compact file formats made compact disks seem too large and limited, so manufactures created MP3 players which are small and hold large amount of data.
Later, availability of MP3 and other compact file formats made compact disks seem too large and limited, then came the pen-drives which are small enough to store at least 8GB information. So manufactures created MP3 players which are small and hold large amount of data.