The songs are stored on the DVD with such a high bit-rate that only 10 wav-format songs will fit on a single disk -- up to 400 Megabytes per song. These songs are also impossible to share across the internet, even if you have hi-speed connection, because you would have to wait an hour or two to transfer the file. Even if you use mp3 compression, a single song could be 25 megabytes in size.

Solid-state has no moving parts so it doesn't drain the battery on your portable devices, and it doesn't skip if you bump it. Compact Flash cards with 2.2 Gigabytes store up to 500 songs in Mp3 format, or 25 songs in wav format. Each card costs $250, which is about a hundred times more expensive than a cd-rw. But how many songs do you store on a portable device? Do you own more than 500 songs? You can still use a bunch of CD-RW to archive larger volumes of audio data, and transfer only what you need to the portable Compact Flash card. But the compact flash card can be used not just for audio data, but any kind of data, making it ideal for PDAs, cellular phones, or laptops with various types of software, such as office applications, video games, internet, and media players.