defrag

Simply this, there are several alternatives that provide a faster and superior defrag experience.

and there are similarly efficient programs, such as Iobit or Defraggler which can be downloaded at MajorGeeks, Filehippo and Download.com.

Good luck.

I prefer to use Diskeeper over the built in defragmenter for various reasons, its faster, completely automatic, works smoothly in the automatic mode even as I use the PC, has low free space defrag, defrags system files and is very thorough, defrags without skipping fragmented files.

Here are the reasons JKDefrag gives: much faster, optimized for daily use, several disk optimization strategies, directories are moved to the beginning of the disk, reclaims MFT reserved space after disk-full, maintains free spaces for temporary files, can defragment very full harddisks, can defragment very large files, can defragment individual directories and files, can be used as a screen saver, can be run from cdrom or memory stick, sources available & can be customized.

Some reasons will be different for other defraggers.

Sources:
http://www.kessels.com/JkDefrag/