Extend system partition

Extend system drive on a 2008R2 server. From Google basically I found where everyone said it takes a third-party software to accomplish this task. This morning in a desire to practice using some of this software I set up a lab server 2008R2. Partitioned the first drive (300GB) into a 100 GB partition and a 200GB partition which I installed the OS to the first 100  GB partition. Installed some drivers, rebooted server. Formatted the 200GB partition copied a few files over to it and rebooted again. All looked good and was ready to download 3rd party software to begin testing.
However on a whim I went into Disk Management, deleted the second partition click on the C: (system) drive and the extend button was available. I extended the 100GB C: to a total of 300GB now.

Is this a fluke, am I missing something
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Disk management can extend C: volumes PROVIDED there is free space AFTER the C: drive.

For example:
a 250 GB disk.
C: is 100
D: is 100
and there's 50 GB of unallocated space

In this scenario, you CANNOT extend C: because the free space is after D:.  A third party product is required to essentially "move" D to the end of the disk and give you 50 GB BETWEEN C and D.  THEN you can extend the space.

You also have to be aware - if the C: drive is next to an extended partition it may look unallocated, you still need to delete the Extended partition.

IF you had:
C: 100
D: 50
E: 100

And then you moved everything off D: and onto E:, then deleted D: you could extend C: into that 50 GB space.

(MBR based disks are limited to 4 partitions - typically 3 primary and 1 extended (the extended can then be broken up into logical drive letters but strictly speaking, they are not partitions.  GPT based drives (C: must be MBR unless computer supports and uses UEFI instead of BIOS) can support up to 127 partitions.)

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warsawtechConsultantAuthor Commented:
Thanks Lee for spelling it out for me

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