Release 10.1A: OpenEdge Getting Started:
Database Essentials

> ## Extents

> Extents are disk files that store physical blocks of database objects. Extents make it possible for an OpenEdge database to extend across more than one file system or physical volume.

> There are two types of extents: fixed-length and variable-length. With fixed-length extents you control how much disk space each extent uses by defining the size of the extent in the `.st` file. Variable-length extents do not have a predefined length and can continue to grow until they use all available space on a disk or reach the file system’s limit on file size.

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