Home Forums Apple Help Reclaiming disk space that is left unpartitioned Forum Rules | Contact Forum Editor | Report a Post Reclaiming disk space that is left unpartitioned magn8p 01:32 05 Jan 2018 Locked After several create-delete partitions, I somehow managed to make over 700G of my 1TB hard drive unusable. I have a 2012 iMac with High Sierra. As can be seen in the , you will find out that only 320GB of the total 1TB is being used. My question is: How can i merge the unused/unpartitioned space with the existing usable partition. If that's not possible, how can I create a new partition and utilise the 700+ GB Thanks. 1]: [click here This thread is now locked and can not be replied to.