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Thread: UEFI vs. Legacy Boot Questions

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  1. #1
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    Question UEFI vs. Legacy Boot Questions

    I am building a new PC with a mobo that has UEFI support. This is my first encounter with this, so I have a few questions.

    1. Are there advantages to UEFI as opposed to Legacy booting?
    2. If I run a 32 bit XP VM in Virtualbox within Ubuntu 12.04 64 bit, must I use Legacy boot?
    3. Is it difficult to convert to UEFI from Legacy if I have started with Legacy and my situation changes?

    Thanks for your help.
    Last edited by cscj01; June 26th, 2013 at 05:44 PM.

  2. #2
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    Re: UEFI vs. Legacy Boot Questions

    I do not know if the VM will isolate XP from the gpt partitioning & UEFI?

    XP does not know about gpt partitions and cannot read them. So XP does not work with UEFI.

    New versions of Windows only boot from gpt partitioned drives with UEFI and UEFI requires gpt partitioning.
    Ubuntu will boot from gpt drives with either UEFI or BIOS.

    So converting if dual booting is a big issue as you have to repartition, reformat to go from MBR(msdos) to gpt(GUID) partitioning. Best to plan ahead.

    Only the 64 bit versions of Ubuntu work with UEFI.

    I finally stopped my XP with my new SSD with gpt partitioning even though I still am in BIOS. To support trim on SSD, you have to have BIOS set to AHCI and XP does not have that driver unless installed during install. And I was not going to reinstall just for that.

    XP is missing a lot of the support for new hardware features and you should think about updating to newer Windows if you really need Windows or retiring it. Its support from Microsoft also stops soon anyway.
    For info on UEFI boot install & repair - Updated Mar 2015:
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to close thread when/if answered completely.







  3. #3
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    Feb 2009
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    Re: UEFI vs. Legacy Boot Questions

    1. UEFI allows for larger HDD and gpt partition table (which means you can have as many primary partitions as you want, no need for the old logical/extended drive).

    2. Virtual Box should isolate XP from the hardware that you are using. A Virtual machine should run regardless of whether you are using UEFI.

    3. I don't know. I got a UEFI motherboard, I moved half of my drives to gpt and I have had no issues with Ubuntu. I would say, just go with UEFI.

    Note that the newest windows machines have locked UEFI, which means that you will very hard time installing Linux. If you can, try finding unlocked UEFI.

  4. #4
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    Ubuntu 12.04 Precise Pangolin

    Re: UEFI vs. Legacy Boot Questions

    Go all-out UEFI. Save yourself the trouble down the line. UEFI will have no effect on VMs. I just finished updating my laptop with 12.04.2 from legacy to uefi - it takes time and will usually require shifting partitions around. Shifting partitions around = risk losing data.
    Last edited by Kow; March 20th, 2013 at 01:23 AM.

  5. #5
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    Re: UEFI vs. Legacy Boot Questions

    Thanks to all who responded. I plan to go with UEFI.

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