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The Block size determines the number of bytes upon which the data in a package is aligned. Empty data pads out entries in the package.

A block size of 1 is sufficient for most platforms. However, when using Wwise's Sample low-level I/O hooks, Windows and Xbox platforms require a multiple of 4096 to match the size of sectors used for unbuffered I/O. Other implementations of the low-level I/O hook that your project uses might have different requirements.

You can set this value as part of the File Packager project settings or, if a project is not being used, as a command-line argument (see Using File Packager arguments in the command line).

For more information about how block sizes are used in the runtime, see Low-Level I/O in the SDK documentation.