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platoxia
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PostPosted: Mon Jul 11, 2016 5:24 am    Post subject: Concerning GPT on BIOS-based system Reply with quote

While the handbook is clear that you cannot dual boot Windows while using GPT on a BIOS-based system because..."Microsoft Windows will boot in EFI mode if it detects a GPT partition label. ", can this be resolved simply by using separate hard drives; one for Gentoo and one for Windows, each with their own boot sectors, then simply choose which hard drive to boot up in BIOS?
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transsib
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PostPosted: Mon Jul 11, 2016 5:42 am    Post subject: Reply with quote

You fail to clarify what your issue is. Or it's just me who does not understand.

If you run a motherboard that has UEFI (DEL or F12 to look or watch the splash
when you boot up the box )then you have two options:
either run it in compatibility mode ( option in UEFI ) and leave your systems in bios mode ( no gpt )
or partition your harddrives gpt and have uefi only in UEFI as option to install in efi mode.

So it's either/or; you cannot have one OS in efi on a gpt partitioned hadrdrive and the other
in good old bios. To install a OS in efi mode UEFI only has to be set in UEFI"BIOS", or the install media won't boot in efi mode.
When you've done that you better leave the setting as is which means any OS on a bios hdd will not boot.

About dual boot Windows/Gentoo I cannot tell you much as I have 2 hdd.
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platoxia
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PostPosted: Mon Jul 11, 2016 5:49 am    Post subject: Reply with quote

Sorry for the confusion. My system is BIOS-based. I have Windows on an SSD. I am installing Gentoo on a 1TB hard drive and would like to use GPT instead of MBR. Can I do this as long as I keep grub 2 on the 1 TB drive without creating problems for my Windows drive?

Edit: To clarify further, I have never used a system with UEFI nor have I ever used GPT, in other words I am pretty ignorant to both of these things.

Edit 2: After reading more about this, specifically this: http://www.rodsbooks.com/gdisk/bios.html, I've decided to forgo using GPT in favor the the tried and true MBR.
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transsib
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PostPosted: Mon Jul 11, 2016 6:53 am    Post subject: Reply with quote

Ok platoxia, eager to know.
I'd say no, but I could be wrong.
Although until now I believed you do not need a gpt partitioned hdd
if you run good old bios for both OS.

Good luck :)
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mirekm
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PostPosted: Mon Jul 11, 2016 9:44 am    Post subject: Reply with quote

You can do that.

Your boot disk must be BIOS based with MBR.
During installation of Windows you have to disconnect your GPT harddisk, because in other case you will not be able to install Windows. After installation of Windows, you can connect again your GPT disk, and install your Gentoo.
It works fine.
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