We should probably clarify that documentation.
"Correct blocking" is needed when writing to tape drives and certain other hardware devices that require each physical write have the exact same size.
Generally, this is a factor only when writing to "raw" or "block" devices:
Writing to memory does not need correct blocking.
Writing to a file on disk does not need correct blocking.
Writing to a raw hard disk (one that has not been formatted with a file system) sometimes requires correct blocking.
Writing to optical drives (CD/DVD writers) sometimes requires correct blocking.
Writing to a tape drive usually requires correct blocking.
Tim
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