Disk Defragmentation

From time to time I come across disk defragmentation applications, an update to one called iDefrag just came across on MacUpdate this morning.

My understanding of these is that they were pretty much useless anymore, and have been for a long time (10+ years) as block and file allocation algorithms have gotten better and better at managing disk space. Add to that the fact that disk sizes have gotten very large, much larger than the needs of most users (two users I know barely use 10% of the space they have), so fragmentation (which usually occurs when free space is tight) is simply not an issue. On top of which modern operating systems try to optimize the location of frequently used files.

All of which suggests that disk defragmentation is pretty much a waste.

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