Why is it not necessary to defragment a Mac HDD?

[lamina]

Eh? Eh?

 

[iGary]

Supposedly OS X does this on the fly, but utilities I use once a month tell otherwise...but I notice no difference in speed...I file it under my "meh" folder.

 

[Eidorian]

http://docs.info.apple.com/article.html?artnum=25668

http://www.kernelthread.com/mac/apme/fragmentation/

http://www.kernelthread.com/mac/apme/optimizations/ (#5)

http://macslash.org/article.pl?sid=03/10/29/190237

 

[lamina]

Thanks for the links Eldorian, they were very informative.

iGary, what applications do you use?