Windows 8 and 8.1 Forums

UEFI

  1. #1


    N.Y.
    Posts : 2,214
    Windows 10 Pro 64bit

    UEFI


    About a few weeks back i bought a SSD was 512GB and i did a clean installl of Windows 8.1 Pro 64bit on it.

    Recently i noticed my BIOS Mode is UEFI. Before this upgrade to the SSD i had a 2 WD 1TB HDD and it was in Legacy Mode then.

    I know i made no changes to my BIOS, before or during this upgrade to the SSD.

    Just wondering what made this automatically do this, change to UEFI.

    Can see it here too.
    Attached Thumbnails Attached Thumbnails Untitled 2.jpg  

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  2. #2


    I guess you just got lucky, a lot of people have a real hard time figuring out how to do it. I just cloned mine over to a new Samsung 850 Pro I had to convert the new disk to GPT to get the clone to work?
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  3. #3


    N.Y.
    Posts : 2,214
    Windows 10 Pro 64bit


    Quote Originally Posted by Clintlgm View Post
    I guess you just got lucky, a lot of people have a real hard time figuring out how to do it. I just cloned mine over to a new Samsung 850 Pro I had to convert the new disk to GPT to get the clone to work?
    I assume that means everything is alright, no need to worry.

    Weird i belive when i upgraded to Windows 8 on this machine i was posting something about UEFI, that the system had it, why was i in Legacy mode, now out of it all i am here,UEFI mode, did nothing different.
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  4. #4


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    1. If your BIOS is set to work for both: UEFI+MBR then you can install in either style.
    2. When you did a fresh install. From the Installation disk, you have the choice to install using GPT style or MBR style and apparently you selected GPT style. See screen shot:

      Click image for larger version
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  5. #5


    N.Y.
    Posts : 2,214
    Windows 10 Pro 64bit


    Quote Originally Posted by topgundcp View Post
    1. If your BIOS is set to work for both: UEFI+MBR then you can install in either style.
    2. When you did a fresh install. From the Installation disk, you have the choice to install using GPT style or MBR style and apparently you selected GPT style. See screen shot:

      Click image for larger version
    GPT I do not get it, for one i booted from the Optical drive using my CD of Win8.1.
    At the boot screen i do not recall it labeled UEFI for a DVD Drive, thought this was only possible with a UEFI Bootable USB Flash
    Drive, with Win8.1 on that.

    No other partitions on the drive. Do you mean this system partition ? Besides the recovery partition.
    Is this good or bad ? Should it be changed. I saw no selections that i recall during the install.
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  6. #6


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    For newer MB, both GPT and MBR sre supported. You are good as is now. I have not seen an installation media, whether it's a DVD or a USB that does not have support for both styles. For DVD installation disk, it would show: UEFI:CD/DVD or CD/DVD in the fast boot menu. You can verify by booting your from DVD and in the fast boot menu, you will see 2 choices.
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  7. #7


    N.Y.
    Posts : 2,214
    Windows 10 Pro 64bit


    Quote Originally Posted by topgundcp View Post
    For newer MB, both GPT and MBR sre supported. You are good as is now. I have not seen an installation media, whether it's a DVD or a USB that does not have support for both styles. For DVD installation disk, it would show: UEFI:CD/DVD or CD/DVD in the fast boot menu. You can verify by booting your from DVD and in the fast boot menu, you will see 2 choices.
    O.k. i tried booting just to see, but with no disc. I did notice in my BIOS now it shows UEFI as first boot, then Crucuial SSD, External HDD and DVD Drive.

    Now from reading this can also only occur when BIOS is set to UEFI before a clean install, as said mine was in the Legacy mode.
    Plus from my image i originally posted, the type is not GPT, but basic.

    I thought this was for only drives over 2TB, plus some say faster boots too. Cons are rootkits can get in easier on boot.
    I will try putting a DVD in and go to boot manager see what happens. By the way my Crucial SSD is only 512GB.
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  8. #8


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    Both GPT & MBR are basic disks. By looking at the partitions, I can tell that you have a GPT style. With MBR style, you only have 2 partitions: 350MB Recovery partition & C: drive
    With GPT, you'd have 4 partitions: 300MB Recovery, 100MB System Boot, a 128MB unallocated but hidden from disk management and C: Drive.
    If you right click on Disk 0->Properties->Volumes. It will tell you that you have a GPT style, see screenshot.
    Do the same for Disk 1, it'll show MBR.
    Click image for larger version

    I thought this was for only drives over 2TB, plus some say faster boots too. Cons are rootkits can get in easier on boot.
    I will try putting a DVD in and go to boot manager see what happens. By the way my Crucial SSD is only 512GB.
    In addition, with UEFI, it will support secure boot and allow you to create more than 4 primary partitions.
    Most of us use a 128GB SSD which is plenty for Windows OS.
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  9. #9


    N.Y.
    Posts : 2,214
    Windows 10 Pro 64bit


    BTW Thanks for responding.
    O.k. i seen it where you told me to look, your are right. What is the unallocated 128MB used for ? Mine in Volume says 1MB.

    I booted with the OS DVD and next to it was UEFI : DVD Drive. So basically by somehow selecting this, my system switched itself to UEFI ? My system unfortunately does not support secure boot.

    Now tellling me another good reason have this is making more partitions ? Seems sort of useless being people did this more for HDD because took them longer to read larger partitions. SSD are much faster, seee no need for it.

    Just trying figure out if this benefits me to keep it this way. And if i do, is it better for my EFI system.
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  10. #10


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    O.k. i seen it where you told me to look, your are right. What is the unallocated 128MB used for ? Mine in Volume says 1MB.
    128MB is Microsoft reserved for future use. In order to see it, you have to use diskpart from the command prompt.
    Win+X->Command Prompt(Admin) then type diskpart, select disk 0, list partition
    Now tellling me another good reason have this is making more partitions ? Seems sort of useless being people did this more for HDD because took them longer to read larger partitions. SSD are much faster, seee no need for it.
    Windows and GPT FAQ (Windows Drivers)
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