sounds like the drive is not connected properly or has some strange formatting on it. Sounds like you are installing a 2nd HDD, so I suspect wrong cable or wrong disk type.
sounds like the drive is not connected properly or has some strange formatting on it. Sounds like you are installing a 2nd HDD, so I suspect wrong cable or wrong disk type.
Where is it installed? If you installed it in the primary drive you may have not gotten the connector snuggly in there. You can try making sure it's in there and if it still doesn't work you could try getting a usb sata adapter (some HD come with one) and plugging it into another computer to format it.
If you're installing it in the optical bay slot you may have just gotten a faulty caddy and/or might have forgotten to reconnect all of the wires (there are quite a few).