GPT requires UEFI BIOS for booting. For NON booting GPT works fine with windows vista 7 8 10. UEFI Class 2.3.1 means you have secure boot in F2 BIOS settings under security. Earlier UEFI Bios Classes DO NOT SUPPORT secure boot and DO NOT SUPPORT UEFI BOOTING. [URL]   BIOS that meets the UEFI 2.3.1 specifications provides the following benefits: [IMAGE]  
Is the M.2 on the T40s mainboard usable or has it been disabled in the BIOS?
M.2 Slot in T40 usabel?