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Message: <blockquote data-quote="WayneF" data-source="post: 310254" data-attributes="member: 12496">OK, maybe an exception, but reading is not destructive (does not change anything), so I imagine it just quits then.What about writing a movie file?  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />   It buffers frames (and writes blocks or sectors), so I imagine it just chooses a good stopping point, and does any necessary tidying up.  File is terminated, but not destroyed.But I doubt the Off switch is an interrupt, it just quits when it loops back around to check it.  And surely tidies up first.</blockquote>