Stellar Drive defrag software optimizes the drive performance by clubbing the fragmented data at the contiguous locations. It provides you several options for demagnetizing your data on the drive which include defrag the meta data, defragmentation of the entire hard drive. It works effectively to improve the performance of the system as it moves all the free space on the drive that is scattered all over the drive to the on single place. It free up the space of storing other data. It defrags the entire volume on the drive. This software is defrags meta data files on the volume. It provides the graphical view of the hard drive which will help you to know what sort of fragmentation id required in the volume. Drive defrag is compatible with the Mac Os X version 10.7, 10.4 and above. I offers you to the boot DVD to defrag the boot volume. The drive defrag software supports Intel as well as the PowerPC based systems. With this software there is no need for you to look out for the update of the software it will automatically download the updated version of the software when ever the next update is available.