Unallocated space - blank space on a disk but is not belong to any partition. Free space - blank space in a partition that can be used for new files. Used space - already occupied by various types of files. In a Windows computer, there are 3 types of space on a hard disk: Why can't extend C drive in Windows 10/8/7 Disk Management Reasons 1: no Unallocated space next to C drive In this article, I'll explain all probable reasons why cannot extend volume in Windows 10/8/7 Disk Management, and how to solve this problem fast and easily. The typical example is that Disk Management cannot extend C drive after shrinking D. Windows 8/10 inherited the same function without improvement, so many people encounter issue while extending partition. 
However, this function only works under specific condition.
However, comparing with traditional mechanical disk, SSD is much smaller because it is still expensive. So the partitions are more likely running out of space, especially to the system C drive.įrom Windows 7, new Extend Volume function was added in Disk Management to help extend partition without losing data. It is helpful to improve computer performance. Nowadays, many Windows 10 computers use SSD for Operating System and programs.
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