If you will be using it as a boot drive you still need to install the OS into that drive but if you're just using it as a data storage drive then u can just use it without having to format.[/quotemsI
Yes, U have an OS installed in my current harddisk. So, to use the other harddisk without loosing data..
What should I do? Should i simply connect SATA cables and Power rail . Will the new storage device appear on nxt boot in computer?