The buffering attributes apply only to RECORD files.
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Abbreviations: BUF for BUFFERED, and UNBUF for UNBUFFERED
Defaults: BUFFERED is the default for SEQUENTIAL files. UNBUFFERED is the default for DIRECT files.
The BUFFERED attribute specifies that during transmission to and from a data set, each record of a RECORD file must pass through intermediate storage buffers. This allows both move and locate mode processing.
The UNBUFFERED attribute indicates that a record in a data set need not pass through a buffer but can be transmitted directly to and from the main storage associated with a variable. This allows only move mode processing.