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Meaning of unformatted

un•for•mat•ted

Pronunciation: (un-fôr'mat-id), [key]
— adj.
  1. pertaining to a disk that has not been electronically prepared to receive files or other text; blank: You cannot save files on an unformatted disk.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.