I dont think his Answer was satisfactory. My M.2 Drive does get detected when I normally start Windows with HDD and I can easily Store Data in it also When I open up my Bios and go to Boot Options I can see PCIE Boot in both Legacy and UEFI Boot Order. I check marked PCIE Boot and also Disabled Secure Boot and bring PCIE Boot at the top in Boot Order. Then in device configuration I enabled PCIE Drive from there as well.
But When I option Boot Menu F9... I dont see any PCIE installed but in Normal Windows I can easily Store Data. I dont know whats happening here. Really Shaking my head for this.
HP has mentioned that Zbook 15 G2 Support Z Turbo Drive 256GB which is Exactly NVME and they claim that Z Turbo does reduce boot time.
Reduce boot up, calculation, and graphics response times and revolutionize how your HP Z Workstation handles large files with the HP Z Turbo Drive TLC G4 SSD, a remarkably affordable and innovative PCIe-based NVMe memory SSD storage solution.
Blazingly fast
Tackle large files and reduce your work time from hours to minutes with a solid state drive powered by ultra-fast M.2 PCIe NVMe technology.
Amazingly affordable
Access up to 5x the performance at a cost similar to today’s standard SSD. The innovative triple layer (TLC) architecture stacks three cell layers on top of one another.
Optimized storage
Integrate your performance by easily combining the HP Z Turbo Drive TLC G4 SSD with high capacity drives.
See the Quote under SSD Hp itself says that.