JkDefrag (x64 bit) 3.36 Free download

JkDefrag is free disk defragment and optimizer utility for Windows released under the GNU General Public License. It's completely automatic and very easy-to-use, fast, low overhead, with several optimization strategies, and can handle floppies, USB disks, memory sticks etc. Included are Windows version, command-line version, screensaver version, DLL library. It's based on standard defragmentation API by Microsoft, a system library that is included in Windows 2000, 2003, XP, and Vista. You can stop program at anytime, it will finish current file in background. In NTFS you're safe even if computer crashes in middle of defragging.