MP3 players. These manufacturers however lost their way after 2004 as they failed to adapt to new iPods - they were also overtaken by the South Korean giant Samsung Electronics by 2006. Sony entered the digital audio player market in 1999 with the Vaio Music Clip and Memory Stick Walkman, however they were technically not MP3 players as it did not support the MP3 format but instead Sony's own ATRAC format and WMA. The company's first MP3-supporting Walkman player did not come until 2004. The new Walkman players were originally referred to as "Network Walkman", with the introduction of the NW-MS7. This DAP plays audio files using ATRAC compression stored on a removable Memory Stick. Over the years, various hard-drive-based and flash-based DAPs and PMPs have been released under the Walkman range, albeit MP3 support only came in 2004. Designed by Samsung Electronics, the Samsung YEPP line were first released in 1999 with the aim of making the smallest music players on the market. In 2000, Creative released the 6GB hard drive based Creative NOMAD Jukebox. The name borrowed the jukebox metaphor popularised by Remote Solution, also used by Archos. Later players in the Creative NOMAD range used microdrives rather than laptop drives. In October 2000, South Korean software company Cowon Systems released their first MP3 player, the CW100, under the brand name iAUDIO. Since then the company has released many different players. In December 2000, some months after the Creative's NOMAD Jukebox, Archos released its Jukebox 6000 with a 6GB hard drive. Philips also released a player called the Rush. While popularly being called MP3 players at the time, most players could play more than just the MP3 file format, for example Windows Media Audio (WMA), Advanced Audio Coding (AAC), Vorbis, FLAC, Speex and Ogg. Many MP3 players can encode directly to MP3 or other digital audio format directly from a line in audio signal (radio, voice, etc.). Devices such as CD players can be connected to the MP3 player (using the USB port) in order to directly play music from the memory of the player without the use of a computer. Modular MP3 keydrive players are composed of two detachable parts: the head (or reader/writer) and the body (the memory). They can be independently obtained and upgradable (one can change the head or the body; i.e. to add more memory). Growth of market On 23 October 2001, Apple