All disk partitions are allocated while building the Server or PC, but things are changing, original partition size may not fit for your needs, the typical example is that system C: drive is full or running out of space. Originally, you have to start over, backup, delete, recreate and restore, what a annoying and time-consuming work. Especially for a server, no one bear it offline for one more minutes.
Then is there an easier and faster way to solve this problem? Yes, shrink D: and expand C:.
In Windows 2003 Server, there is no built-in tool to shrink a partition. In Windows Server 2008, you can shrink and extend partition in Disk management or diskpart command, but due to the limitations, you cannot extend C: drive by shrinking D:.
How to shrink D: drive
Open disk management and check disk layout, the aim is shrink D: to smaller and expand C: to larger.
Step 1: Launch Partition Assistant Server, you'll see all disks and partitions and other properties of each partition.
Right-click drive D: and select "Resize Partition", in the pop-up window, drag the left border rightwards.
There will be some free Unallocated space created at the end of C: drive.
How to expand C: drive
Step 2: Right-click C: drive and select "Resize Partition", in the pop-up window, drag the right border rightwards to hold the Unallocated space.
Click OK, in the main window, you'll find that partition D: shrank and drive C: expanded.
Click 'Apply' on top left to proceed resizing operation.
In the pop up window, you'll see the pending operations.
If there is no mistake, click 'Proceed', within several minutes, partition resizing completed. Check in disk management.
Is it indeed easy to shrink D: and expand C: drive? lol
You can only extend a drive by shrinking other partitions on the same disk, no partitioning software has the ablity to resize partitions between two physical hard disks.
In conclusion, you just need to drag and drop on the disk map to shrink drive D: and get some free Unallocated space, and then extend C: drive with this space. No need to format, reinstall or doing anything else. It is amazing if you close the open files in the partitions you want to shrink and extend before running this program, you can change partition size in Windows without server offline.
Pay attention to data security
No matter you want to shrink D to expand C or shrink other partitions, all partition resizing operations will change the parameters of disk partitions, so you'd better select a reliable partition software, no one wants to see data loss or boot failure and make things worse.