When parts of files are saved in different locations on a disk the disk is?

When parts of files are saved in different locations on a disk, the disk is said to be fragmented. Fragmentation occurs when the operating system saves files in non-contiguous spaces, leading to inefficiencies in reading and writing data. This can slow down system performance, as the disk drive has to work harder to access the scattered pieces of a file. Regular defragmentation can help organize the data more efficiently.