Windows 7 requires more than 8GB to be stored. In that configuration the OS would be put on the 1TB hard drive. Are you absolutely certain you are buying an 8GB solid state and not a 128GB solid state? 8GB does not hold a lot of data in 2014. If you are indeed purchasing a 128GB solid state then the OS would be loaded on the SSD for performance reasons. That would give you approximately 100GB of usable space for critical applications/games as best practice is keeping your SSD at a minimum of 20% free.