disk_set (Parted User’s Manual)

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2.4.2 disk_set

Command: disk_set flag state

Changes a flag on the disk. A flag can be either “on” or “off”. Some or all of these flags will be available, depending on what disk label you are using:

pmbr_boot

(GPT) - this flag enables the boot flag on the GPT’s protective MBR partition.

The disk’s flags are displayed by the print command on the "Disk Flags:" line. They are also output as the last field of the disk information in machine mode.

(parted) disk_set pmbr_boot on

Set the PMBR’s boot flag.