4 Replies Latest reply: Feb 6, 2009 7:40 AM by DaddyPaycheck
B. Hunter Level 1 (10 points)
I am upgrading.
Selling our iMac G5 bought in 2005.
What is the best way to wipe a hard drive clean?
I want nothing left behind. No data.


MBP 2.2Ghz C2D 15.4, Mac OS X (10.5)
  • Baby Boomer (USofA) Level 9 (57,297 points)
    See Erasing disks securely

    Restoring your computer’s software

    Start up from your install disc, go to Disk Utility and select the disk and click erase - to securely erase data click Security Options and Erase Free Space which will entirely wipe your disk, overwriting it with zeros so that no data is recoverable.

  • Rod Hagen Level 7 (31,985 points)
    Depends on how critical you see the process as being, B. Hunter.

    If you are simply worried about an average user accessing your credit card number or the like then simply running the erase free space will probably do the job. Using the maximum "zeroing" security options when erasing with Disk Utility increases the difficulty of retrieval to the "impossible" level when you get to "35 times", but it takes a heck of a long time to run!

    If you reckon Mossad, MI6 or the KGB will be trying to prise out your data, though you can take it one step further by simply replacing the drive! A 250 Gig SATA drive, like the largest ones fitted to most 2005 iMac G5's will cost you $50 these days , and you can always bung the old one in an enclosure and use it as a backup or for additional storage. If you have a "first generation" or "ALS" model iMac it is VERY easy to do yourself. With the built in iSight G5 models it is harder, though , and you might have to add a repair shop charge to the cost.


  • Ian Bickerstaffe Level 6 (14,235 points)

    The only really secure way is to use a very large hammer!

    Cheers Rod.

  • DaddyPaycheck Level 6 (16,030 points)
    Yeah, I'd go with a sledge.