The primary partition installing Windows 8 does not have much unused space left, so I deleted the partition right after it to release free space and planned to extend system partition with this space. But finally I found I cannot expand the primary OS partition since the function “Extend Volume” is in grey. A thumbnail is attached:
There is free space contiguous and after the OS partition, but why can’t I extend the partition? I am confused and need a wonderful solution.
Before answering this question, we need to know difference between unallocated space and free space. Space shrunk from a primary partition is called unallocated space while space shrunk from a logical drive is called free space. Free space can not be used to extend a primary partition while unallocated space can not be used to expand a logical partition. From the thumbnail above we can see there is jus a free space, so it can not be used to expand the primary OS partition.
There is a quite good solution to this problem, namely turning to a third-party partition manager. Here, MiniTool Partition Wizard is recommended for it can take unused space from any place on the same disk to increase the size of partition that has operating system.
Step 1: enable the partition manager to get its main interface:
Step 2: select the OS partition and click “Extend Partition” from action panel.
Step 3: take specified unused space from an existing partition or unallocated space to extend the target partition and click “OK” to go back to the main interface.
Step 4: click “Apply” button to apply changes.
Now, the work to increase the size of partition that has operating system is finished. If users also cannot expand the primary OS partition with system built-in Disk Management tool, turn to the recommended partition manager right now.