GPT partitioning - why is it recommended with UEFI?
Hi
3rd time re partitioning my 1TB SSD so hoping to get it right. Learning but still many questions:) Because my system has UEFI firmware and already have a SSD dedicated to Windows my understanding is that I MUST have a UEFI boot partition on my 2nd SSD dedicated to Linux. And if using GPT partitioning in addition it needs to have the 'boot' flag set. My first point of confusion is conflicting device I am reading about GPT vs MBR-msdos partitioning. At ubuntuforums here under Two Drive Installs>Partitioning it states https://ubuntuforums.org/showthread.php?t=2147295 Quote:
ubuntu-mate.community see Part 4: Create a UEFI boot partition. + swap + root + home partitions. Which is right? Why is GPT partitioning recommended for UEFI? |
Use gpt regardless of (U)EFI - it will (eventually) make your life easier.
As you seem confused enough, don't create an efi partition on any disk other than the boot (Windows in your case) disk. Simply use the one already present. Most Linux installers recognise this implicitly. |
It's simple. A UEFI chip working in native mode can't boot from a DOS disk. DOS disks have their bootloader in the mbr and the UEFI boot mechanism doesn't look there. It only looks in the efi system partition.
You can (at the moment) use a UEFI in compatibility support (legacy) mode with a DOS disk but who knows how long that mode will continue to exist? |
Hi again eco_bach ...
As mentioned above, GPT (GUID Partition Table) is progressively replacing the old MBR (Master Boot Record) partition table. Also as mentioned above, GPT does away with the 4-primary-partition limit of MBR. Most new firmware is UEFI instead of BIOS based and, again, as mentioned above, UEFI will probably stop supporting MBR-based partitioning down the road. So - short answer - go GPT. That said, I don't see the conflicting advice in your above example - Ubuntu is just suggesting a typical partitioning scheme. If you really do have 2 separate physical hard drives (SSD or otherwise), and want to be able to boot from either, you need to have an ESP (EFI System Partition) on each one. Partitioning as a subject can be a little daunting at first - judging from your 2 recent posts, I am guessing you are fairly new at it. I suggest reading up on it, but feel free to post other questions if needed. Cheers, |
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Cheers :-) |
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