The New and Improved UNIX File System

The early history of UNIX development consisted of two competing flavors of UNIX: the original AT&T/Bell Labs release and the Berkeley System Definition. The original code from AT&T could not be sold, as antitrust laws didn't allow AT&T to compete in this arena, but the company was allowed to provide copies of its operating system code for free, and many universities took them up on the offer. The University of California, Berkeley, became a hotbed of UNIX development efforts, and one of the first areas it addressed was the file system.

The original UNIX file system was unique in its approach to file data management but had several weak points in its design. Among them was its dependency on the all-important ...

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