- When you are going to work with partitions,
it makes sense to understand
about the differences between MRB and GPT.
So MRB is Massive Boot Record,
and that's a part of the original PC standard,
which was defined in 1981.
MRB is pretty minimal.
In MRB, a 512 byte sector is used on disk
to store the stage one boot loader,
as well as the partition table.
And in these 512 bytes,
64 bytes are reserved for the partition table.
In these 64 bytes, 4 primary partitions can be created
on the disc with a maximum size of 2 terabytes.
If it goes beyond 2 terabytes, you can't use MRB.
To create more than 4 partitions,
one primary partition can be assigned
as an extended partition,
in which logical partitions can be created.
Now GPT is the newer partitioning scheme.
It stands for GUID Partition Table,
and it was introduced in the 2000s
to deal with the MRB shortcomings.
It addresses up to 128 partitions directly,
and that makes that you don't need to think
about primary, extended, and logical partitions anymore.
And it supports a maximum disk size of 18 exabyte
where one exabyte is 1024 petabyte,
and that is 1024 terabyte.
Pretty big that is.
All modern computers and operating systems
support GPT partitions.
It is kind of funny though,
but you will still see many new installations
that are using MRB,
because if it's a cloud instance,
if it's simple, if it's small,
there is nothing preventing you from using MRB.
And that is why for the exam,
you should know how to deal with MRB partitions,
as well as GPT partitions.