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When you create a GPT partition table on a storage drive, how much of the space is used up by GPT itself? I'm assuming it's on the order of megabytes.

I'm mostly just curious, but when I search this online, I can only find information about the maximum size of a disk that GPT can work with.

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How much (of the) space is used up by GPT itself?

I'm assuming it's on the order of megabytes.

No, it is much smaller, for example 16384 bytes for 64-bit Windows: 128 entries of 128 bytes each.

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  • So the secondary GPT entries are just duplicates of the first ones?
    – Aaron Franke
    Commented Nov 2, 2019 at 21:16
  • "the GPT provides data duplication; the header and partition table are stored both at the start and the end of the disk." so yes.
    – DavidPostill ♦
    Commented Nov 2, 2019 at 21:22
  • @AaronFranke Note that 16,384 bytes assumes the logical block size to be 512 bytes, which is not always the case.
    – Tom Yan
    Commented Nov 3, 2019 at 13:06
  • A sgdisk backup of a GPT just gave me 20Kbytes of output.
    – Tom Hale
    Commented Feb 20, 2022 at 9:27
  • 128 * 128 byte entries gives size, has nothing to do with number of bytes per sector, does it?
    – Joep van Steen
    Commented Jun 9 at 11:05

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