Getting rid of lots of hard drives

[crazycat]

Long story short, i have over 8 desktop hard drives and around 20 portable hard drives that i have been using in my LAN over the last few years. What is the best way to get rid of them all and make sure the data on them are gone for good?

Thanks in advanced.

 

[yellow]

7-pass (or greater) erase, then drill the platters.

 

[Bobacus]

Trip to the gun range?