erasing hard drive question

Hello!
Atm i have a plan to sell some of my hard drives.
What is the best way to erase them ? i need 100% warranty on non recovery^/

Writing zeros , not a bulett prof solution.
Here i read about Cipher.exe
http://www.thewindowsclub.com/cipher-command-line-tool-windows
what you think?
May be you know some other effective solutions?

 

The only 100% guaranteed solution is to physically destroy the drives.

 

You could also just take the drive apart. You could recycle the platters as drink coasters and the magnets for something fun/scientific.

 

If you have any sensitive data on those drives then heed the advice of the post #2 and #3.

 

i heard Dban, can do the job. atleast on consumer level.
have some drives that i dont use anymore and think its a good idea to test and sell them.

@saturnotaku, scientific? i like science. but what can i do with them? exp may be something like motor prototype.

 

Use your imagination. The magnets inside hard drives are really powerful for their size.

Here's one thing you can do with them. Not scientific, but certainly practical if you have the need:

 

Zero or making partitions and deleting and repartition will prevent any standard software recovery.

Zeroing will effectively render most undelete software unable to recover unless your NSA or CIA or China Bureau.

I use KillDisk from Active Delete the registered version and that is more then destructive enough.

Only real destructive way is Physical destruction or the Smelting Iron Foundry. Most every John will not take the time if you Zero the drive for most joe.

 

Thank you.

 

Dban is the most secure as far as i know but can take hours if the guntman method is used as it can do upto 40 passes of the drive.