磁盘碎片是导致电脑速度变慢和不稳定的主要原因，免费软件IObit SmartDefrag能够最有效的帮助你轻松整理碎片。它拥有独特的“安装后自动运行”以及碎片智能诊断技术，无需任何设置和人为操作，就能够全自动运行。

采用业界最先进的ExpressDefrag技术，IObit SmartDefrag碎片整理速度非常快，而且还能够对磁盘的文件系统同时进行优化。借助领先的静默整理技术，IObit SmartDefrag在后台利用计算机的空闲时刻自动进行碎片整理，让你的硬盘一直保持最高的运行效率。IObit SmartDefrag绝对不带任何插件，对个人用户，家庭及小企业用户是完全免费的。

The main cause of slow/unstable PC performance is disk fragmentation. IObit SmartDefrag helps defrag your hard drive most efficiently. With "Install it and forget it" feature, it works automatically and quietly in the background on your PC, keeping your hard disk running at its speediest. Slow down, freeze-ups and crashes will be a thing of the past. IObit SmartDefrag is 100% FREE for personal, home and small business, and 100% safe from any spyware, adware and virus. IObit SmartDefrag is designed for Windows Vista, XP and 2000.

Key Benefits

Ultimately easy to use
Install it and forget it. The intuitive interface makes IObit SmartDefrag the ideal utility for complete dummies.

Ultimately Efficient Defragment.
No more long time waiting, IObit SmartDefrag has the fastest defragment engine in the world, designed especially for modern large hard drives.

Optimize File System
Not just simple defragment, IObit SmartDefrag also streamlines the file system and makes your computer run at the top speed and most stability.

Always-on Working
IObit SmartDefrag works automatically and quietly in the background, constantly keeps your computer fragment-free.

Free and Free
IObit SmartDefrag is 100% freeware. You can get it and update it without any penny.

官网：http://www.iobit.com/SmartDefrag/index.html
~Support Windows 2000/XP/Vista~

官方下载：(Free~)