This paper published by Raxco Software given as an educational instrument explains how and why disk fragmentation happens, explains the costs of fragmentation, explores some myths about fragmentation, and examines the differences in disk defragmentation solutions. International Data Corporation in a white paper entitled Disk Defragmentation for Windows NT/2000, Hidden Gold for the Enterprise, estimated that the global cost of fragmentation is $50 billion annually. There are many factors that contribute to this cost and some of them are not all that obvious.
There is a common misconception that disk defragmentation is not necessary in RAID or SAN/NAS storage environments. At the core of this issue is the common perception that disk defragmentation software directly shuffles around disk clusters. That belief is incorrect. This paper explains how disk defragmentation really works and how it can deliver significant benefits to RAID or SAN/NAS storage.