Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Better than the standard Windows defragmenter

I recommend this product because of it's improvement in two general areas of disk defragmentation:1) It does most of its work in the background stealing idle cycles to defrag key files and keeping your disk somewhat tuned.2) It also has a more sophisticated tunning process. It can tune the master table in addition to just files, it also seems capable of defragmenting disks that the standard defragmenter cannot do (I never understood this limitation).I have noticed a significant performance improvement since I installed Diskeepeer.