If you are planning to get rid of your computer, that old external hard drive or you want to do a real data cleanup on that flash drive, then use Active KillDisk to safely remove the data.
The FREE version of Active KillDisk will suffice in most cases for PC’s and other drive media that is commonly used in the home environment. Believe me, it is better to use Active KillDisk than to use the standard windows utilities of FDISK, FORMAT utilities, or DELETE. Using the standard windows utilities will only skim the layer leaving remnants of data that can be easily recovered using any free data recovery software; whereas, Active KillDisk will format the drive and then completely overwrite it making the disk virtually unreadable. Again, for home based computers, the FREE version of Active KillDisk will get the job done.