For a study that contains transport (.xpt) files, JMP® Clinical reports a nonzero size on disk. However, if the .xpt files are replaced with the corresponding .sas7bdat files (and the study metadata is refreshed), a size on disk of zero is reported.
This issue is corrected in the JMP® Clinical 7.1.2 hot fix (link below).
JMP® Clinical 7.1.2 hot fix
[Previously JMP Note 65972]