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Old 02-18-2014, 08:34 AM   #1
Registered: Feb 2010
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Protective master boot record boot flag (pmbr_boot) with BIOS

Today I set up a ArchLinux install on a BIOS system using Syslinux.

The first partition (sda1, which contains /boot) starts at 1049 kB. It has both boot and legacy_boot flags set. But I had to use parted to set the protective master boot record boot flag to "on" for the disk sda as well to have the BIOS to boot from that disk.

Does the pmbr_boot flag always have to be set to "on" for a BIOS system to be able to boot from a GPT disk? Or are there some cases where it's enough that the boot partition itself has the boot flag set?

Last edited by Beaverfriend; 02-20-2014 at 03:18 PM. Reason: clarify


bios, boot, flag, parted, syslinux

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