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English word malformatted comes from English mal-, English formatted
mal- (English)
Bad, badly as in maladjusted, malcontent - faulty, faultily as in malfunction. Not.
formatted (English)
(computing, of a storage medium) That has been physically arranged to be in a state ready for the storage of data. That has been given a definite format.
malformatted (English)
(chiefly, computing) Poorly or incorrectly formatted.