Have you ever faced the problem   You cannot creat a new volume error! while allocating unallocated partition of harddisk or ssd. Disk allocation error This is the easy way to solve this problem this will defineately solve your problem, Solution: Step 1:Download, install and open this app  AOMEI Partition Assistant ||   Download Step 2:Open app And you will see this interface: Step 3:Click on unallocated space* Step 4:Then select Creat partition and a box will appera. Step 5:Leave it defeault and press ok. Step 6:On the top left you will see apply button. Click on it. Step 7:New box will popub. Click proceed and yes. After few second your problem is solved.