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Solution—Release Overallocated and Unused Space

The simplest solution in many cases is to release the overallocated and unused space in the other data sets on the volume. This quite likely will actually increase the degree of free space fragmentation, but it can also provide much larger areas of contiguous free space, which solves the problem. This function does not require exclusive use of the volume (let alone the entire machine), and is very fast. If a volume defrag is still needed, having released the idle space beforehand provides an even greater return from the defrag run.