Determining Free Space Fragmentation with hfsdebug

hfsdebug can go through the volume allocation bitmap and calculate a list of free extents, along with their sizes, on a volume. Thus, you could determine the size(s) of the largest free space chunk(s) on your volume. A popular name for this appears to be “free space fragmentation”.

Although hsfdebug could quantify free space fragmentation earlier, I did not add an option to print this list out. The newest version of hfsdebug supports the -0 option for this purpose. Please refer to Fragmentation in HFS Plus Volumes (updated) for more details.

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