Hi, I just install a new Crucial M4 128GB SSD to my mid 2011 mini. This is mounted along with the stock 750G HD. However, I couldn't erase (format) or partition the SSD. It will show "unmounting disk" for a long time, the error msg with "Partition failed with error: Wiping volume data to prevent future accidental probing failed." It seems to be working fine when I first mounted it in an external USB HD case. Problem started when I mounted it into the mini. I thought I saw people here using Crucial SSD without problem. I am lost, not sure what to do with it. Appreciate any advises. Thanks.