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The File Manager allows your application to access files and folders on physical storage devices such as disk drives. It supports several volume formats, including HFS and HFS Plus. Starting with Mac OS 8.1, HFS Plus provides improved storage efficiency by supporting smaller default allocation block sizes. Starting with Mac OS 9, HFS Plus also provides support for long Unicode filenames, files larger than 2GB, and extended file attributes.

File Manager Reference This document provides a complete reference to the File Manager APIs.       TN 1150: HFS Plus Volume Format This Technote describes the on-disk format for an HFS Plus volume. It does not describe any programming interfaces for HFS Plus volumes. This technote is directed at developers who need to work with HFS Plus at a very low level, below the abstraction provided by the File Manager programming interface.