Learn how to build things, everything using simple tools. Unless your rich or extraordinarily lucky, you will have difficulty launching any product that you can not build with your own two hands (and a dremel tool). Investors, companies, and business partners have all seen thousands of inventors with ideas but absolutely no clue how to build them. By showing them a working prototype or even a detailed mock up you will have one step above most other "inventors" . If you can develop a clear model in your head and and then build it with your hands, then a manufacturer will be able to do the same.
Sorry, you patent isn't worth anything, since you've shown it at an inventors' fair and told us about it.
However, I don't think anybody here will be infringing your patent, since there are other cheaper and more reliable methods for destroying data on a hard drive.
As for inventing stuff being the easiest part of the process, who are you kidding? A good idea is not an invention. Check out the autobiography of Trevor Bayliss to find out what a real inventor spends his time doing.
It looks nice, but it still needs a lot of work, such as fixing the link to the description of your zapper.
This is how to fix a zapped hard-drive:
http://www.instructables.com/id/EP5PIZKKBEEP286RSA/
Either way, keep on inventing. My problem is:
1. IDEA, wow this is a good one this time!!!
2. HEY MOM GUESS WHAT <insert idea here>
3. Uhm, pretty sure that has already been invented...
4. ????
5. no profit
Keep on truckin'
(Yeah I think the main reason people don't like this instructable is because its more of a showing off instead of spreading the knowledge, I viewed it as more of a possible inspiration for people)