1. A method for modifying a first storage medium having a plurality of files including a first file that includes a plurality of data blocks, wherein the first storage medium includes a first metadata structure that describes the plurality of files, the method comprising: providing a first modification tool; operatively coupling the first storage medium to the modification tool; constructing a second metadata structure that describes the plurality of files; and dematerializing, using the first modification tool, at least the first file to form one or more dematerialized files, wherein the dematerializing of the at least first file includes: rendering the first file inaccessible without destroying the plurality of data blocks of the first file and without releasing the plurality of data blocks of the first file for reallocation, and modifying directory information that describes the at least first file.