NY Times article about how "white box" PC manufacturers fit into the retail PC landscape. Includes a note about what kind of storage these "niche" PCs are shipped with:

The machine he bought last year has a 720-gigabyte hard drive for storage — or 18 times more than a typical desktop PC sold today.

[...]

A shift in PC use from tasks like writing documents and sending text-based e-mail to entertainment uses like music, photos and video could touch off a new cycle of demand for PC hardware and software. An hour of video, for example, consumes a gigabyte of storage. "It'll blow the lid off," Mr. Andreessen said. "It will happen. It's just a matter of when."
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