Trashed my hard drive. Had previously upgraded my HDD x2 in my aging macbook pro, as well as 2 major OS updates, so I thought it was time for a cleanup. With lion on an old Core 2 Duo macbook, it is running rather slow I has also previously accidentally completely filled the drive while shuffling data around and rebuilding new servers, so I really wanted to optimize the drive. Checked, file defragmented, and file optimized without problem. However, it took many nights to try and "volume optimize" my hard drive, after which the map couldn't pass a sanity check or boot, despite reporting "success." Lost 1 week's worth of data (saved by automated time machine backups) and a day putting it all back together. Never again--- I'll just let the OS manage the drive itself and leave the "optimizing" to the windows crowd.

PS: Other than the obviously broken HDD tools, the other tools aren't useful.