Not 'full' de-fragmentation, Microsoft labs did a study and after 64MB slabs of contiguous files you don't gain much so they don't care about getting gigabytes

Not 'full' de-fragmentation, Microsoft labs did a study and after 64MB slabs of contiguous files you don't gain much so they don't care about getting gigabytes fully defragmented. https://web.archive.org/web/20100529025623/http://blogs.technet.com/b/filecab/archive/2006/07/10/disk-defragmenter-faq.aspx https://web.archive.org/web/20100529025623/http://blogs.tech... old article on the process