I've just bought a new HP Envy laptop (HP ENVY 15; 16GB, 256GB SSD + 1TB HDD, Touchsmart; 4th i7-4700MQ; Windows 8.1 Pro 64-bit).
The machine has a hybrid disk with 256GB SSD and 1TB HDD capacity.
Strangely the Operating System (and everything else) is installed on the HDD part of the disk and...