2 Replies Latest reply: Jan 27, 2013 12:18 PM by steve359
zipmac22 Level 1 (0 points)

Hi, I just got done installing a new hard drive in to an iMac and used a portable hard drive when I use SuperDuper. Everything transfered without any problems. But now I want to erase the portable hard drive that contained all of the transfered data. What is the best way to erase that data so I can use the portable hard drive so I have a clean drive and can use it to back up with Time Machine?

  • Niel Level 10 (298,367 points)

    Use the Disk Utility in the /Applications/Utilities/ folder to repartition it as GUID(or APM if you're using a PowerPC Mac) in the Mac OS Extended (Journaled) volume format.



  • steve359 Level 6 (13,297 points)

    If it was set up for SuperDuper, it should be Apple-format.


    Go into DiskUtility, select the partition of the external in the left column, and you should have an "Erase" option at the top of the main-activity window.  You can decide if you need more than simple "Erase" (you can do a 7-pass erase, but nromally that is used when transferring a disk to a new user/buyer).