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GUID Partition Table
lets assume that you want to create a new GPT[link1] layout on a disk.
From command line you can use gdisk[link2]
Contents
Create new layout
gdisk /dev/sda o Y
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Create a new partition
eg. you need a 5G rootfs partition:
n [enter] [enter] +5G [enter]
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Create a swap partition
eg. the rest available space is for swap:
n [enter] [enter] [enter] 8200
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Save layout to disk
w
Y
Verify your changes
gdisk -l /dev/sda
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[link2] http://www.rodsbooks.com/gdisk/