Since any repairs resulting from a surface scan would be the responsibility of the drive firmware it should be safe.

Again the principal danger occurs if out of date versions of DW, TTP, DG, or whatever attempts to make repairs or changes to the system — particularly to the file or volume structure. There are also potential problems with any test, repair, etc that uses command line utilities as those can and do change from OS X release to OS X release.

If we knew what it was we were doing, it wouldn't be called research, would it?

— Albert Einstein