Merge partitions with Diskpart (Windows XP and Server 2003).To explain better, I divided the introduction into 2 parts. Many people feedback they do not know or worry about merging partitions, so today I want to share my experience about how to merge partitions in all Windows platform, including Windows 10/8/7/Vista/XP and Server 2016/2012/2008/2003 (R2). There is free Unallocated space but you do not want to create any more drives, so you may consider merge the Unallocated space to an existing drive.The system C: drive or a data drive runs out of free space, you can add unused space from another drive by merging the two partitions.Some manufacture PCs/servers, even the one you built it yourself may not meet your needs after running the PC/server for a period. How to merge partitions and Unallocated space in Windows?