How can I delete everything off my hard drive?

How do I tell my computer to delete everything before I close out?

I need to take things off a flash drive.I put some stuff in it that I didn't want to and it filled it up.

ok so I got my laptop today bc I broke my other one. they charged me 179.99 to back my laptop up bc I have SOOO much importan...

If you get a new hardrive, is everything on your my documents deleted? [didnt mean to put that pic I cant figure out how to...

I'm thinking of getting a portable hard drive to put all my Photos, videos and music on, so I can get more memory on my lapto...

I keep getting memory errors can not read. how can I check my memory and hard drive. I use XP pro My computer is an AJP LOND...

how do I delete everything on my computer except for the windows xp?

I installed a disk drive for photos other than my system drive and now it seems to be directing some files to that drive, but...

How do you reformat the hard drive in a dell dimension 4550 desktop computer?

I have a mac with 2 internal hard drives, I have been using one for the operating system and the other one for extra storage....