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Do i need to convert my hdd to gpt from mbr??

Previously I had an Intel based PC with ASUS P5G41-MLX which used BIOS, so my HDD partition was MBR obviously. Recently I have upgraded my PC with UEFI based Motherboard which is MSI 970 GAMING motherboard. But I'm not sure about converting my HDD to GPT for a future OS upgrade or a clean OS installation, as I just plugged my OLD HDD with Windows OS with my new Motherboard. So far there is no issue. As I told earlier that my new Motherboard is UEFI based Motherboard but surprisingly my system information is showing that I'm on LEGACY BIOS mode. Does it mean that I'm running OLD BIOS instead of UEFI?
Check the image below


And my BIOS menu is showing this

So Do I need to change it to GPT ?

My Computer

System One

  • OS
    Windows 8.1 Pro


New Member
If you want to use Secure Boot, you need to install Windows 8.1 64-bit in UEFI boot mode. Secure Boot only works in UEFI boot mode, when you enable Secure Boot in your PC's UEFI firmware (BIOS) settings. Secure Boot protect users from rootkits and other low-level malware attacks by blocking unauthorized (non-signed) executables and drivers from being loaded during the boot process.

Here is info about UEFI Boot Mode (installing using the GPT partition style) and Legacy BIOS Boot Mode (installing using the MBR partition style): link

My Computer

System One

  • OS
    Windows 10
    Computer type
    System Manufacturer/Model
    Lenovo G580
    Intel Core i5-3230M
    8 GB
    Graphics Card(s)
    Intel HD Graphics 4000
    Microsoft Edge
    Windows Defender, standard user account
    Other Info
    UEFI firmware (BIOS) embedded Windows 8 product key.

Cliff S

Missing my GIF avatars:(
Pro User
Bamberg Germany

Also if you want to use the Fast Boot hybrid sleep mode, you'll need UEFI. A clean install with windows 8 and above isn't such a pain as it once was as long as you sync your settings w/OneDrive and if you have your libraries on a second internal drive.

My Computer

System One

  • OS
    Windows 8.1 Update Pro in Hyper-V/Windows 10 Pro 64 bit
    Computer type
    System Manufacturer/Model
    Cliff's Black & Blue Wonder
    Intel Core i9-9900K
    ASUS ROG Maximus X Hero
    32 GB Quad Kit, G.Skill Trident Z RGB Series schwarz, DDR4-3866, 18-19-19-39-2T
    Graphics Card(s)
    ZOTAC GAMING GeForce RTX 2080 Ti AMP! Extreme Edition
    Sound Card
    (1) HD Webcam C270 (2) NVIDIA High Definition Audio (3) Realtek High Definition Audio
    Monitor(s) Displays
    BenQ BL2711U(4K) and a hp 27vx(1080p)
    Screen Resolution
    1920 x 1080 x 32 bits (4294967296 colors) @ 60 Hz
    Hard Drives
    C: Samsung 960 EVO NVMe M.2 SSD
    E: & O: Libraries & OneDrive-> Samsung 850 EVO 1TB
    D: Hyper-V VM's -> Samsung PM951 Client M.2 512Gb SSD
    G: System Images -> HDD Seagate Barracuda 2TB
    Corsair HX1000i High Performance ATX Power Supply 80+ Platinum
    hanteks Enthoo Pro TG
    Thermaltake Floe Riing RGB TT Premium-Edition 360mm and 3 Corsair blue LED fans
    Trust GTX THURA
    Trust GTX 148
    Internet Speed
    25+/5+ (+usually faster)
    Edge; Chrome; IE11
    Windows Defender of course & Malwarebytes Anti-Exploit as a
    Other Info
    Router: FRITZ!Box 7490
    Sound system: SHARP HT-SBW460 Dolby Atmos Soundbar
    Webcam: Logitech BRIO ULTRA HD PRO WEBCAM 4K webcam with HDR

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