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Mac OS X 10.3 Defrags Automatically

Posted by pudge on from the hot-character-adaptive-respawning dept.

EverLurking writes "There is a very interesting discussion over at Ars' Mac Forum about how Mac OS X 10.3 has implemented an on-the-fly defragmentation scheme for files on the hard drive. Apparently it uses a method known as 'Hot-File-Adaptive-Clustering' to consolidate fragmented files that are under 20 MB in size as they are accessed. Source code from the Davwin 7.0 Kernel is cited as proof that this is happening."

1 of 181 comments (clear)

  1. Re:Amortized cost... by bdsesq · · Score: 5, Insightful

    Noting this, the fastest way to get data off a drive might not be a straight line.

    This is true. However it is also true that a defrag does not have to put the data in physically contigious blocks. It can just as easily put the data in whatever configuration makes retrevial work fastest on that particular drive geometry.

    This means that an intelligent defrag can improve performance.