I am selling my Mac Pro G5 and I have been through heck of the 7 secure erase pass and It always said startup disk is almost full. So i used the Disk Sweeper and delete ALOT of GB finally. Now a couple of days ago I did the 7 secure erase pass and it completed in about 2 hours, BUT it didn't say any pop up message , thank goodness. So i believe it succeeded fully. Everything was all greyed out when done. But how it the world do you know if it is done and worked so i can sell my mac.. like I said before I used the Disk Sweeper and erased all my hidden files and other Software. So how do you know and tell when the 7 secure erase pass worked and is succeeded?