In a move aimed squarely at iPod, Sony today introduced the NW-HD3 Network Walkman, its first hard disk-based player to support the popular MP3 song format. The 20GB device is the successor of Sony’s first hard disk Walkman (introduced earlier this year), which only supported the company’s proprietary Atrac file format. Sony claims that the NW-HD3, which now comes in four new colors, plays 2.5 times longer than the iPod on a single charge, and can hold several thousand more songs thanks to the Atrac compression. However, the new Walkman will sell for approximately 30 pounds more than the iPod. It will be available in the UK before Christmas at 249 pounds ($462.70) and elsewhere in Europe in early 2005 at 369 euros ($489). The NW-HD3 will also go on sale in Japan this month for around ¥42,000 ($408.76). There is no word yet on US plans.