The Difference Between the system with hard drive and without hard drive. Hard drive is for data storage. That's means the system with hard drive would be able to record and playback. The system system with hard hard drive would not record.Yourself if you choose the system without hard drive. Option: With 1TB hard drive. This item is in the category "Home, Furniture & DIY\Smart Home & Surveillance\Home Surveillance\Home Surveillance Parts & Accessories\Other Surveillance Parts & Accessories". The seller is "isansco_official" and is located in this country: GB. This item can be shipped to United Kingdom.