Hp hdd no show computer

Is this an external 1TB Hard Drive? Maybe it's to big for your computer. If it's an external drive try it on another computer and see if it works. There is also the possibility that the external 1TB drive is bad.

If it's not an external hard drive then try the steps below.

Click Start/My Computer and see if your hard drive is listed as a device. If not, turn the computer off, remove the battery, remove the cover that houses the hard drive on the bottom of the laptop then remove the hard drive from the bay. Wait 30 seconds and put the hard drive back into the bay and reboot. Now see if the hard drive is shown under My Computer. If not, the drive might be bad.