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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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Links
[link1] https://en.wikipedia.org/wiki/GUID_Partition_Table

[link2] http://www.rodsbooks.com/gdisk/