Comparison


Program	Abelssoft	Microsoft	O&O Software	Piriform
Program	JetDrive	Windows Vista Defrag	O&O Defrag 11	Defraggler

Harddisk defragmentation

Defragments internal and external harddrives	Yes	Yes	Yes	Yes
Checks, if defragmentation is really needed	Yes, timeplanned	Yes	Yes	Yes
Cleans temp folders before the defragmentation	Yes	No	No	No
Quick defragmentation for important system files	Yes	No	No	No
Defragments particular choosen files	Yes	No	No	Yes
Defragments the Windows swap file	Yes	No	Yes	No

Registry-Defragmentation
Minimizes the Registry	Yes	No	No	No
Defragments the Registry	Yes	No	No	No

Memory-Defragmentation
Optimises the memory	Yes	No	No	No

Harddisk-Check
Detects errors	Yes	No	Yes	Yes
Fixes errors	Yes	No	Yes	Yes

Main functions
Fully automated process, which reboots or shuts down the PC	Yes	No	No	No
Shows the progress	Yes	No	Yes	Yes
Shows harddisk infos	Yes	Yes	Yes	Yes
Displays cluster reservation	Yes	No	Yes	Yes
FolderVisualizer which finds big files on the drive	Yes	No	No	No

Timeplanning
Defragments when the system starts (if necessary)	Yes	No	Yes	No
Defragments while the pc idles	Yes	No	No	No

Usability
Fast overview	Yes	Yes	Yes	Yes
Wizard	Yes	No	Yes	No
Defragmentation reports	Yes	No	Yes	No
Customizable surface	Yes	No	No	No

Service
Handbook	Yes	No	Yes	No
Email-Support	Yes	No	Yes	No