Wikipedia
DiskTune
DiskTuna, formerly known as DiskTune is a freeware defragmentation program for Windows XP, Server 2003, Vista, Server 2008, and 7 10 (both 32-bit and 64-bit). It supports FAT16, FAT32 and NTFS file systems.
As common with other defragmentation programs, DiskTuna uses the Windows defrag API. DiskTuna is capable of moving the Master File Table (MFT) while the file system is mounted. DiskTuna provides boot and application launch optimization utilizing the Windows layout.ini (see Prefetcher). DiskTuna counters interaction between the Shadow Copy service and defragmentation I/O by offering a VSS safe-mode option. DiskTuna monitors the hard disk's temperature using S.M.A.R.T., and can warn the user if it overheats.