Many Windows 7 users may have encountered the situation where system partition is lacking in space, so many applications can not be installed and the operating system runs slowly and is not stable. In this situation, some users will delete some unimportant data to release more unused space for operating system and applications, thereby changing the unfavorable condition. However, that operation is only a temporary solution, but can not settle the problem, because we can not remove the data if all data are important. So, to change partition size is a pretty good choice in this situation. According to the practical situation, changing partition size in Windows 7 will solve the problem easily and with the experience of resizing partition in Windows 7, the similar difficulties could be fixed readily in the future.
For Windows 7 users, there are two ways to change partition size in Windows 7: using the built-in disk management tool and using the third-party partition magic. Due to the limitation of the built-in utility, if we use the first method to resize partition in Windows 7, there must be unallocated space behind and adjacent to the partition to be extended; otherwise, extending partition can not be realized. However, applying the third-party partition magic is more flexible. With AOMEI Partition Assistant, even if there is no unallocated space next to the target partition, you can also realize extending partition in Windows 7.
Step 1: launch AOMEI Partition Assistant, right click on D and select "Resize" option in the drop-down menu.
Step 2: In the pop-up Window, drag the left slider bar rightward to shrink D. Then Click "OK" to continue.
Step 3: Then there will be an unallocated space contiguous behind C drive. Right Click C and choose "Resize" option.
Step 4: In this window, drag the right slider bar rightwards to expand C drive into the unallocated space.
Step5: Click "Apply" button on the toolbar to save all the changes.
So please free download this free disk manager to manage your hard disk well.