Download Aomei Partition Assistant
Cleaning and even resizing partitions are hard tasks that cannot be accomplished without the aid of a software. Manually cleaning a disk drive might be easier, as long as you know exactly where to search for files, but repartitioning a hard drive is no easy task at all, being almost impossible to do without a software.
Aomei Partition Assistant is an application designed to not only correctly clean partitions, but it can also be used in order to merge two partitions into a new one, allocate unused space to an older partition and convert partition types. The great advantage about the software is that it supports a disk capacity of up to 4TB.