收藏的音轨的大小和位置依据当前电脑连接并挂载外部设备（比如音频 CD 或便携式音乐播放器）的不同而有所变化。
Your collection may vary in size and composition of music tracks, depending which external devices (such as audio CDs or portable players with music) are connected and mounted on your computer.
Zune—微软开发了一款相当好的便携式音乐播放器，但是相对于iPod70 %的市场份额，Zune的市场份额从来都没有超过2%，最近已经停产。
Zune - Microsoft built a decent portable music player, but the Zune was never able to grab more than 2% market share against the iPod's 70%, and was recently discontinued.
去年Apple销出了约8,000,000个iPod便携式数字音乐播放器，并且在2004年有140,000,000次通过Apple的iTunes下载数字音频文件。
In the past year, Apple has sold some 8m of its iPod portable digital music players, and 140m digital tracks have been downloaded through Apple's iTunes in 2004.
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