madmick wrote:
I am a bit confused about UEFI. I can understand the idea. If I have a modern machine it is UEFI. If I have an old computer it is EFI. I partitioned a drive to GPT and tried to install some modern software and it overwrote my MBR. I ended up with a GPT error so that I couldn't see all my old photos etc on the drive.
If a computer is UEFI what other operating systems can I put on it?
UEFI is actually a replacement for BIOS. It's the basic firmware (software that's built right into the hardware) that enables your computer to access attached hardware and boot into an operating system.
You can run any modern operating system on a computer that has UEFI. In fact I think you might have to go back to Windows 98 / ME to find an OS that wouldn't run on UEFI.
Where GPT comes into play - on Windows systems, you can only boot from a GPT partitioned drive if the computer has UEFI. If it still has BIOS, you can only boot Windows from a MBR partitioned drive. You can boot Linux from a GPT partitioned drive even on an older BIOS computer, though.
I don't believe it's possible to have both GPT and MBR partitions on the same drive. And any time you make changes to drive partitioning you risk losing data.
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