I bought this a long time ago. I did a full defrag on my Master while booted in the slave. A month later my brand new Master HD fried and took my Slave drive with it. I had a year old external HD so you know the rest of that story.

So I'm sure this app didn't do the damage, but now I'm sorta afraid of it now. They keep fixing issues, so that means it's still beta to me.

When it's a final product, I might try it again, but I didn't notice any speed improvements like the old Norton utilities defrag used to do years ago, and it didn't fully defrag, like putting ALL the colors where they go, but mostly it did. It was just sorta taking out the free space and compacting the drive.

Even if an app does damage, the maker will never fess up to it. There is one application I trust, SuperDuper, because it's an Awesome finished stable bootable cloning application. Just using that actually defrags, then you clone back to the master drive and there you have it.

I'm not shooting iDefrag down, it just scares the hell out of me, and always has. I'm not sure if they have a detailed PDF manual that explains in easy terms on what the different operations do and how to use them, but I'll go look for it.