Please use the site map first before asking questions on this Forum! There is also a search box you can use. This is explained on many pages, many times! The NTFS file system will always use 'virgin' free space first before it overwrites 'dirty' space from deleted files. When you copy a file to a volume which has been recently formatted the file will usually be contiguous. Once the drive has been 'filled' with files (i.e. a 32GB volume has had 32GB of files copied to it since it was last formatted), then there will be no large contiguous free spaces left and any newly copied files will be spread out over several blocks of free space and thus be non-contiguous.