Here is a great way of ensuring any data stored on your old hard drives is wiped completely and forever, something that even by taking a hammer to the hard drive or storage device does not always do completely. The Data Killer is made by the Japanese based Platform of Japan and although it is easy enough to use, you have to think that the equipment is going to be rather expensive to buy and run.
According to the people behind the Data Killer, Platform of Japan, this is what the machine can do;
“To put it simply, this is a device for wiping out magnetic data. Its strong magnetic field obliterates the data on a hard disk, so you can think of it as a “data crusher.” It erases data instantly. If you have data you need to get rid of, Data Killer can do it without taking lots of time.”