This is a very good application if you think your hard drive need to be defragmented… Review for this app are strange.. Some users love it, other hate… Personally i keep my hfs+ volume intact. Description: Every Mac user has noticed it; over time, your system slows down. This is particularly true in these days of constant security updates, as replacing operating system components not only increases file fragmentation, but also creates a more insidious problem—over time, the operating system itself ends up scattered all over your disk. This, of course, doesn’t show up as fragmentation—after all, the files themselves are probably contiguous—but nevertheless, it takes your machine longer to start up, it takes programs longer to start, and it takes longer to get your work done. iDefrag solves these problems and more, by defragmenting and optimizing your Mac’s filesystem.
What’s New in Version 2.2.8
Note: This version is not compatible with OS X 10.10 Yosemite. This is an update for existing users so that iDefrag will run on OS X 10.9.5 when it s released.
Minor change to the behaviour of the “Check for Errors” option.
Compatible with upcoming Gatekeeper changes in 10.9.5 update.
Fixed a hard-to-trigger bug in our HFS code that might have caused a crash.