2 Replies Latest reply: Dec 1, 2011 10:39 AM by videoexpert1
videoexpert1 Level 1 Level 1 (0 points)

I am selling my iMac. I want to erase my personal data from the computer but I keep getting an error:

Secure Disk Erase Failed

Secure disk failed with an error:

couldn't unmount disk.

According to this fourm http://forums.macrumors.com/showthread.php?t=1236267 it appears to be a bug in Loin. Does anyone know how to fix this?

  • mulligans missus Level 2 Level 2 (370 points)

    According to that it has nothing to do with a bug in Lion. Try starting up off your original disc and repairing your hard drive. Zero out all sectors if necessary and then install. If your disk keeps failing to mount, I would suspect the drive has failed. Maybe DiskWarrior or TechTools can repair it.


    Good Luck

  • videoexpert1 Level 1 Level 1 (0 points)

    When I try my orginal disks it will not work because I upgraded to Loin. I have downloaded the drive for Loin and that is what I have been using to try this.

    Its not the hard drive because it is working just fin for me now. Searching the web it appears many people are all having the same problem, but no solution.