Defragmentation UI in Vista and Windows Server 2008 was limited to essential information and controls. In Windows 7 the UI intends to make defrag operations more transparent and match task demands of the user. List of features provided through Windows 7 Disk Defragmenter UI: 1. Analyze and defragment each volume to improve disk performance 2. Monitor defragmentation progress and state for each volume 3. Schedule a job for regular defragmentation. In Windows, defrag’s scheduled on entire volume, which can be formatted with standard windows file systems: NTFS, FAT and FAT32. Volume can be a basic partition or dynamic types: Simple, Stripped, Mirror, RAID-5. Type of disks that host a volume have an impact on automatic scheduling of defrag on volume. Besides normal rotating hard drives, interesting types of disks in context of defrag are: Expandable Virtual Hard Disks (VHD) and Solid State Drives (SSD). Defrag cannot be automatically scheduled on volumes hosted by SSD disks and running defrag on volumes hosted by SSD disks isn’t recommended.
Full Article: Storage Team blog