Hi Wenfrey,
Assuming you've entered the correct device category for your question, then I'm afraid I have bad news for you; no, there is no separate hard drive that can be removed and replaced. From the device page itself:
[quote]Unfortunately for the repairability of this device, both the memory and flash storage are soldered directly to the motherboard.[/quote]
Without specialized tools and expertise, us DIY-ers are out of luck with upgrading this laptop's storage. It can be done by experienced repair technicians, but it's a difficult process to unsolder those parts and even then you have to find a pin-compatible part with more storage that the system BIOS may or may not be able to handle.
So the short answer is, no, you can't replace the hard drive, sorry.