Normally, Microsoft System Reserved Partition, MSR, is meaningless; you can directly delete this partition and merge msr to C Drive, but still we receive alerts about the system reserved partition being full occasionally,
So we'll guide on how to expand system reserved partition in GPT disk on Windows Server 2008 R2 using Partition software – Partition Expert Server.
Note: if you there's no "Resize/Move Volume" option in the list when you click system reserved partition, you can click "Format Volume" and reload again.
Some people would like to remove system reserved partition and add the 128MB to other partitions, but server disk management "delete partition" option is greyed out in the right-click menu of that partition, so we have to remove it by using third-party disk manager: Partition Expert.
Steps to remove system reserved partition:
Now system reserved partition become unallocated space, but Extend Volume is grey out in C Drive's right-click menu, still cannot extend system partition, now we need to expand C Drive in Partition Expert again:
Sometime system reserved partition lays at the end of the disk, the final partition, when you open file explorer (Windows Key + E), it will show in the volume list, but it is often used, it often distracts you. Let's just hide this partition so we don't have to looking at it again and again without doing anything.
Steps to hide system reserved partition in Partition Expert:
Open Windows File explorer again, you can see this partition in not in the list.