Clean Install Windows 10  

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  1. Posts : 69,617
    64-bit Windows 11 Pro for Workstations
    Thread Starter

    Joanne said:
    OMG, ahaha, I've just checked and my installation is showing as Legacy BIOS! And actually all of them so far have been the same because during the boot I have never selected that "UEFI USB option...........

    Well.... I didn't have any issue so far... With one word, Brink, am I losing much if I keep installing Win 10 using legacy BIOS?

    And most importantly, on my next installation in which I will choose UEFI , do I have to do something different when I will be burning the image from the ISO, using Rufus?

    Thank you.

    If your happy using Legacy BIOS, then there's no need to reinstall using UEFI unless you just wanted to. You can read more about UEFI at the links below, but it pretty much comes down to if you need or want the extra features and security that comes with UEFI.

    You shouldn't need to do anything different other than select the UEFI USB when doing a clean install of Windows 10 with UEFI. :)
    Last edited by Brink; 09 Nov 2015 at 20:31. Reason: added quote
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  2. Posts : 18
    10 (& hopefully 7) Pro64

    Thanks again for another lighthouse Brink!

    Followed the guide carefully as I've just assembled my new Skylake build but didn't get the 4 partitions/UEFI.

    I guess I don't understand the new BIOS settings as my last system is P45 era and the new build is Z170m-D3H | 32G | i5-6500 | AIO liquid | Intel 535 SSD until M2 (no mechanical drives).

    You wouldn't be able to point me in the direction of any BIOS guides/settings would you please? (Did read the links you posted above this post, and managed to skim through this whole thread today, noticing a few other users reporting the same system reserved partitions only)
    Last edited by GDavid; 09 Nov 2015 at 19:44. Reason: Last line edit italicices
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  3. Posts : 69,617
    64-bit Windows 11 Pro for Workstations
    Thread Starter

    Hey David, :)

    You can use the tutorial below to see if you are currently using Legacy BIOS or UEFI for you Windows 10 installation.

    BIOS Mode - See if Windows Boot in UEFI or Legacy Mode

    I haven't played with M2 yet to know how it behaves with the partitions, but I would think it would be the same if you deleted all partitions on it during Windows Setup.
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  4. Posts : 18
    10 (& hopefully 7) Pro64

    Had a very quick look earlier before posting, giving it a read now. Z170m new look BIOS was a big surprise to me...

    Definitely not UEFI, nor have I had any success as yet trying to enable it

    Nothing I try in the BIOS, or anything I get from examining the USB installer key does anything that creates the multiple partitions on the intended boot drive. 6 times I've been through this.

    UEFI USB Win 7 installed. How to check if it really is in UEFI? Solved - Windows 7 Help Forums

    Really frustrated now, time to leave the computer alone for a few hours.
    Last edited by GDavid; 09 Nov 2015 at 23:29.
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  5. Posts : 69,617
    64-bit Windows 11 Pro for Workstations
    Thread Starter

    Since you installed with legacy BIOS, you would need to enable UEFI in your UEFI firmware settings, and do a clean install again if you wanted to have Windows 10 with UEFI installed.
      My Computers

  6. Posts : 18
    10 (& hopefully 7) Pro64

    Thanks Brink, I'll come back to it when I can figure out those settings which are required. 'Trying to find information on the BIOS settings required even if the key I have for installation shows the bootEFI(?) files... It's staring me in the face I know, but it's really hard to find the guidance/info.
    Sorry to TC up your thread.

    After walking away for a while and doing something else I returned for "just one more try"....
    As everything else had been done it seemed a good idea to re-create the install media.

    Even though it contained the UEFI files, it was formatted incorrectly as an ntfs volume
    . Sure I'd read something over the last 36 hours about FAT32 being a requirement for USB install keys...

    Rufus! Anyway I had a play with the settings and eventually re-wrote the USB key correctly after a couple of tries. (There seems to be a not-so-logical order in which the settings in Rufus need to be applied to get the iso to build to correct UEFI installer formatting of the USB key)

    Transferred key to new machine, booted to USB and deleted the (2) existing partitions as described in step 13 then "new" target of un-allocated space got the 4 partitions. At that point came the realisation I'd finally succeeded...
    Last edited by GDavid; 10 Nov 2015 at 08:10.
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  7. Posts : 69,617
    64-bit Windows 11 Pro for Workstations
    Thread Starter

    Great news David.
      My Computers

  8. Posts : 2
    Windows 10 Home


    I have a Dell XPS 13 (Early 2015) laptop which has been upgraded from Win8.1 to Win10 (assuming UEFI)

    If I wanted to create a bootable USB flash drive to perform a clean Windows 10 install the windows media creation tool would create a bootable drive compatible with both Legacy and UEFI installs and I wouldn't have to worry about whether the USB drive was formatted FAT32 or NTFS as the creation tool would do that all for me?

    Also, in Step 13 (UEFI) where the instruction is to delete all partitions and then click new->apply->ok, select partition 4 and then click next.....what happens instead if you delete all partitions until there is a single unallocated space and then just click next (not new-apply-ok-next)? Will it automatically create the 4 partitions across the entire volume for you?

    And one last question which I am sure is a stupid question that answers it self but the recovery partition that is created as one of those four automatically created partitions -- that partition will allow me to hit reset sometime in the future if Windows 10 starts getting buggy and it'll restore my system back to fresh?

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  9. Posts : 69,617
    64-bit Windows 11 Pro for Workstations
    Thread Starter

    Hello Alex, and welcome to Ten Forums. :)

    Yes, MCT will create a bootable USB that can be used for legacy BIOS or UEFI.

    At step 13, you can also just select the unallocated partition and click on Next to continue the installation. I just included the extra bit to help show the process more.

    The recovery partition is just for WinRE to use advanced startup options at boot. One of those options is to reset, but it will use the default Windows image included on the Windows drive. If the image is corrupted or can't be found, Reset will just ask you to connect installation media for it to use instead.
      My Computers

  10. Posts : 58
    Windows 10 Pro

    Hey Brink,

    I am building a new PC from older parts, I want to use one of the drives from 1 of 3 PCs that I have (then part out PC). I am wondering how I can accomplish this project.

    Here is the setup:

    1st PC has windows 10 from upgrade (WD 300gb 10k)
    2nd PC has clean install, using this tutorial (WD 300gb 10k)
    3rd PC has Win7, not upgraded to 10 yet (Kingston 120gb SSD)

    I'd like to use the 3rd PC's SSD on the new build, though its 2 years old (warranty is 3 yrs), maybe still use this for another year then upgrade. Though I could still use the velociraptors (bought in 2011) again for another year as I plan on heavy duty usage for new build.

    Well either way, if I want to install 10 on the new build which install should I use?


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