Help Erasing old iMac

[SHEESH]

Hi, I'm turning in a 2011 iMac and wanted to erase the hard drive first but Disk Utility won't let click 'erase', the only options it lets me have are 'partition' and 'first aid'. I updated to the newest OS and ran First Aid hoping that would solve it but still isn't working.

Does anyone have an idea on how to get around this and delete all the info?

Thanks in advance for the help, I'm stuck on this one.

 

[wardie]

Make a backup clone of your hard drive onto a USB external disk. Ensure it is bootable. Boot from it (hold down option key when start up and select the external drive). Then you should be able I think to pick your internal disk and zap it.
A tool like Carbon Copy Cloner is good for creating backups but there are many others or just disk utility I think would work.

 

[EdwardC]

Check this out.

https://support.apple.com/en-us/HT201314

 

[cohen777]

http://osxdaily.com/2016/04/28/erase-free-space-mac-command-line/
[doublepost=1510888356][/doublepost]http://mireth.com/shredit/shredit-x/shredit-x-tutorials/shredit-erase-free-space-mac/

 

[cynics]

Using file vault?

If so before you can click erase you'll need to select the disk then click file than unlock that volume. Its something like that my memory is a bit rusty.