write node behaviour – turn on read file parameter

hi i’m confused with the write node.. while i turn on the ‘read file’ , it will load the images from disk instead of its input, but then why can’t i disconnect the input since it doesn’t need its input anymore ? coz in this stage it will load from disk, why i got error (blank) when trying to disconnect it? is there any good reason? can anyone explain it?
Also why that ‘read file’ only works for reading image sequences, what about .mov ?

thanx

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