Webaroo has developed a set of proprietary search algorithms that whittle the estimated one million gigabytes on the Web down to more manageable chunks that will fit on a hard drive.

They include up to 256 megabytes for a growing menu of “Web packs” on specific topics — your favorite Web sites, city guides, news summaries, Wikipedia and the like — that make up the service’s initial offerings; and about 40 gigabytes for the full-Web version the company intends to release later this year.