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Why there is a partition type in GUID Partition Table?

What are they using for?

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up vote 3 down vote accepted

Because partitions hold different types of data. Here's a list of some of them.

Operating systems use the type code to decide whether a partition is one that it's interested in. For example, Windows only creates drive letters for partitions with specific types that it's aware of; it'll ignore partitions belonging to other operating systems, since it doesn't expect to understand them. And EFI firmware looks for a partition with a special "system" type code and uses it for booting.

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