Install wont format target disk

I am a newbie here. Just downloaded FreePBX and booted is up onto a HDDrive that is close to full. Within the first GUI page FPBX is asking me to dominate a disk for install. I select the Disk (an SSD). It tells me that there is not enough room to install. I attempt to delete data on the disk but it doesn’t work. What am I doing wrong. I cant find a tutorial that includes this option and I cant get FreePBX install to delete or format the HDD.
I have installed Elastix, Issabel and vitalPBX in a test siuation with the install process being very similar and have not had this problem

Any help would be appreciated/

Install wiki page:

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