DiskTune

DiskTune is an easy to use, on-demand, no frills disk optimizer and defragmentation utility for FAT, FAT32 and NTFS formatted drives. Through a simple to use mechanism to create 'jobs' it enables you to launch one-click jobs and schedule jobs. DiskTune is freeware. DiskTune will reorganize your disk and will make it faster and more responsive.
DiskTune is safe: It relies on the proven and reliable Windows defrag API to move files. It checks the volume state prior to defragmentation. DiskTune features a VSS safe-mode and a thermal monitor.
Features:
Works in Microsoft® Windows® XP, 2003 Server, Vista (32-bit and 64-bit).
Supported file systems: FAT16, FAT32, NTFS.
Safe to use: utilizes Windows defrag API and other high level APIs only.
3 operating modes: defrag, optimize and compact.
HDD temperature monitor; DiskTune will pause if your disk gets too hot.
Easily create and run jobs.
VSS safe-mode to reduce interaction between defragmentation and shadow copies .
Background and low priority mode.
Context menu integration, can defrag selected folder only.
Boot optimization utilizing the Windows layout.ini file.
MFT optimization.