How do i reformat my hp 520m - Fantom Titanium Hard Drive

You have to format a hard drive with a third party disk unless its a usb data drive
Restart your computer

During the boot process you will see on the screen to press a certain key to enter setup usually the Delete or F2 key this will vary depending on your operating system

Press and hold that key during the boot up process to enter BIOS then using the arrow keys navigate to advanced bios features press enter change your first boot device to cd press escape then press f10 to save to cmos restart

or if you are using a USB
insert your usb drive

click start right click on my computer select open you should see your USB drive
right click then select format

another way is to control panel administrive tools,computer management disk management right click on your drive select format

hope this helps