"Supports Tiger filesystems

Send email notifications or make noises when done.

Supports HFS and HFS+ (Mac OS Extended).

Supports case sensitive and journaled filesystems.

Supports adaptive hot file clustering (“Hot Zone”).

Four powerful defragmentation algorithms:

• Compact data, moving all free space to one place.
• Optimize filesystem metadata.
• On-line defragmentation.
  Defragment whilst your disk is mounted.
• Advanced programmable optimization.
  Rearrange your disk the way you want.

B-Tree metadata file compaction/optimization support.

Thermal monitoring to make sure your disk doesn’t overheat.

High performance user-defined file classification engine.

Per-block and accurate whole disk display.

Detailed statistics so you know whether you need to optimize.

Inspector allows you to view details of individual extents/files.

Quickly jump to specific files to examine them in more detail.

Altivec accelerated display for improved performance.

Auto-update feature ensures you always have the latest version.

AppleScript support"