You can free download disk erase software from http://www.minitool-drivewipe.com/. MiniTool Drive Wipe can easily wipe disk data and the wiped data can not be restored no matter by software or hardware to ensure data safety.
Disk will generate large numbers of fragments in long use leading to data increasing and finally the system is slow. Reinstall system will not solve it. The redundant data includes junk files and virus files. Reinstall system will not remove virus or Trojan. So how to eliminate disk fragments thoroughly?
MiniTool Drive Wipe can not only erase disk but can wipe disk and fill sectors with Zero to format disk.
Wipe Disk - Fill Sectors with Zero of MiniTool Drive Wipe can wipe data on disk in 100GB size and can shield bad sectors automatically. The program will not end because of bad sectors. After fill sectors with Zero, the whole disk will not remain redundant data, even virus is cleared. The disk is a new one and you can partition your disk and install operating system. MiniTool Drive Wipe is little and easy to operate. It can support 32/64 bit Windows 2000 professional, Windows XP, Windows7 and Vista. Moreover, MiniTool Drive Wipe is free software and you can visit http://www.minitool-drivewipe.com/download.html to download the latest MiniTool Drive Wipe Software.