How to use new boot drive and ignore/erase old one

Discussion in 'Mac Pro' started by mrt209, Nov 15, 2012.

  1. mrt209 macrumors 6502

    Nov 21, 2010

    so I purchased a new SSD a couple of weeks ago for my boot drive, and with my luck it was defective. So I requested a replacement and I have cloned the old boot drive onto the new one (the replacement).

    Because I have to send the defective SSD the back, I am trying to erase the content on it, however disk utility wont let me do it thinking it is still the main boot drive.

    So basically, I currently have two boot drives, and I want to erase the partition on the defective SSD. I have set the new SSD as the startup disk but that didn't help.

    Is there another way to tell OS X that the new SSD is the boot drive that matters so I can delete the old one?

    Thanks for your help and sorry if what I described doesn't make sense lol.

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