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Differences in Primary GPT Header

From: Tobias Arp
Subject: Differences in Primary GPT Header
Date: Wed, 17 Feb 2010 13:13:07 +0100 (CET)


i am using parted  2.1 aand i have some questions about gpt partitions.
I have created a gpt partion on a harddisk. After creating a ntfs file system 
on this partition i got full access to this drive.
I could read and write successfully on it. 
I viewed the primary gpt header on my linux computer and printed it.
Then i put this harddisk on my windows 7 pc. The harddisk is detected 
successfully and i can access all files.
But  after having the drive in my windows computer changes are made to the 
primary gpt header.

Following values aree changed: 

Offset 0x20 = Backup LBA 
Offset 0x30 = Last usable LBA 

Both are decreased for about 30 sectors.
Windows does it.

When i look into the documentation of gpt partitions it seems to be right what 
windows has done.
Can someone agree?

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