Sounds like you have a bad HDD. You can either RMA your whole notebook, or buy a new HDD.
You
could try reseating that HDD connector, though. This involves unpowering the notebook, pull the power plug, open up the bottom cover, and removing the drive then taking the connector off and putting it back on a few times. This will help if there is oxidation on the connector contacts.
I'm not sure which drive is the Data drive, but it won't hurt to do that on the System drive, too.