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- When you are going to
work with partitions,

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it makes sense to understand

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about the differences between MRB and GPT.

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So MRB is Massive Boot Record,

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and that's a part of the
original PC standard,

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which was defined in 1981.

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MRB is pretty minimal.

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In MRB, a 512 byte sector is used on disk

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to store the stage one boot loader,

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as well as the partition table.

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And in these 512 bytes,

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64 bytes are reserved
for the partition table.

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In these 64 bytes, 4 primary
partitions can be created

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on the disc with a maximum
size of 2 terabytes.

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If it goes beyond 2
terabytes, you can't use MRB.

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To create more than 4 partitions,

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one primary partition can be assigned

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as an extended partition,

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in which logical
partitions can be created.

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Now GPT is the newer partitioning scheme.

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It stands for GUID Partition Table,

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and it was introduced in the 2000s

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to deal with the MRB shortcomings.

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It addresses up to 128
partitions directly,

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and that makes that
you don't need to think

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about primary, extended, and
logical partitions anymore.

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And it supports a maximum
disk size of 18 exabyte

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where one exabyte is 1024 petabyte,

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and that is 1024 terabyte.

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Pretty big that is.

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All modern computers and operating systems

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support GPT partitions.

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It is kind of funny though,

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but you will still see
many new installations

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that are using MRB,

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because if it's a cloud instance,

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if it's simple, if it's small,

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there is nothing preventing
you from using MRB.

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And that is why for the exam,

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you should know how to
deal with MRB partitions,

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as well as GPT partitions.