Answer: defragmentation
Explanation: Data is usually stored on hard disk by splitting or dividing files into smaller units, bits or chunks, this usually occur when there is no contiguous space to hold the complete file, hence, the break up process so that the files fit into the available space. Thus process of storage is called disk fragmentation.
Disk defragmentation is used to reorganize file fragments scattered on the hard disk in other to improve system performance, increase efficiency and clean up files in other to provide additional storage.