Boot in recover mode with command R, select disk utility, remove the main partition or just reformat it, your call under disk utility and reinstall using the recovery partition. If you prefer you can boot from the OS stored on a USB stick, completely remove all partitions with disk utility and reinstall. Either way works.

On Nov 28, 2016, at 9:53 AM, Andrew Hodgson <andrew@hodgsonfamily.org> wrote:

Guys,

What is the quickest way of deleting all partitions on a Mac? Like diskpart clean?

I will then install from fresh media.

Thanks. Andrew. _______________________________________________ Blind-sysadmins mailing list Blind-sysadmins@lists.hodgsonfamily.org https://lists.hodgsonfamily.org/listinfo/blind-sysadmins