Erase my hard drive of windows and all.?

Question

Thanks for reading, i have low computer skills and dell sold me a bigger hard drive for my inspiron 640m.I had to ring to find out why it wouldn't do anything when i put it in.(that's an eg of my knowledge) i had to put windows on it and stuff.Well i stuffed it and they will take it back, before i send it can i rub off all the stuff i put on it.i started doing cable transfer and god knows what else.

So, erase back to blank, zip, zilch, nothing, empty, bare, clear, vacant, vacuous, void

Answer 1

what worked for me and was suggested by someone who knows computers is

turn the computer off then as it is starts back up hold down the F10 key on the keyboard for about 30 seconds.. i think. it gets rid of everything. i hope it works for you.

Answer 2

take the cover off the harddrive and than take a magnet and rub it on the disks before you do this however make sure with the manufacturer that it wont s***w it up(it does on some models)

Answer 3

I recommend Darik's Boot and Nuke.Darik's Boot and Nuke ("DBAN") is a self-contained boot disk that securely wipes the hard disks of most computers. DBAN will automatically and completely delete the contents of any hard disk that it can detect, which makes it an appropriate utility for bulk or emergency data destruction.

Please note: It is possible (though extremely unlikely) to recover data even if it has been erased and written over many times. The only true way to ensure data is never recovered is to physically destroy the drive.