Recently I had the fun of removing the hard drive from a Dell Inspiron Ultrabook 14Z. The hard drive is located under the battery. Where is the battery you may ask??
First you need to remove the memory cover and the memory modules. Under one of the memory modules is a hidden screw. With that screw removed you can remove the keyboard by pushing up on the three clips at the top of the keyboard.
Once the memory cover is removed the CD ROM is free to be removed as well. There is one screw above the CD ROM that has to be removed.
There are seven screws under plastic covers underneath the laptop and four screws under the keyboard that need to be removed. Three are near the front edge and one is near the CPU fan as seen in the picture below.
Next release the four ribbon cables. Then the top cover comes off by releasing catches all around the edges. Now you can see the battery. There are two screws holding the battery in. The hard drive is then reachable.