You need to resize partition in Windows 7
A partition is a division of a hard disk drive with each partition on a drive
appearing as a different drive letter. Generally speaking, you may want to resize
hard drive partition in Windows 7 in following situations.
System drive is too small. When you receive the prompting message: low disk space during computer use, it is time to resize Windows 7 partition. Because you
cannot even open some sort of files or applications.
Data drive is too large. Another case is plenty of disk space has been
divided into one data drive. It would be a mess if you store all data on that
drive. Therefore, it is necessary to change partition size in Windows 7 and then
create one more partition for different sorts of data.
Unreasonable partitioning on the disk. Most PCs were partitioned before the
customers take it. Some of them have only one partition named C drive, and some
of them have many partitions that are not quite helpful.
Anyway, no matter why you want to resize partition in Windows 7, it is important to
figure out how to perform partition resizing. In total, this passage details three
easy-to-follow methods.
Resize Windows 7 partition free with built-in tools
Windows offers two different utilities with graphical user interface and command user
interface. One is Disk Management and the other is Command Prompt. Let’s get to know
them one by one.
Resize Windows 7 partition in Disk Management
1. Press Windows key + R key to open Run. Type diskmgmt.msc and
click OK. Run as administrator. Find Disk Management under Storage tab.
2. Right click the partition you want to resize. You can select “Shrink Volume” or
“Extend Volume” from the given list. Take Extend Volume for example.

Tips:
To use “Extend Volume” function, there should be an unallocated space
adjacent to the selected partition. Otherwise, you’ll get extend volume
grayed out trouble.
If you choose “Shrink Volume”, you are likely to shrink only half of the
selected partition due to hibernation files, etc. in most cases. To break the
restriction, you can turn to shrink
C drive beyond half.
3. Follow the wizard to complete the extending.
Resize C drive in Windows 7 via Command Prompt
1. Open Run as instructed. Type cmd and run as administrator.
2. Type following commands in sequence.
list disk
select disk n (where n is where the target partition on)
list partition
select partition m (where m is the partition you want to resize)
extend size=10240 (it will extend by 10GB)
exit

To extend partition in Diskpart, make sure there is also unallocated space
contiguous. Otherwise, the operation may not be able to complete.
Those two methods are quite simple, but their limits sometimes prevent our behavior.
For instance, if there is no unallocated space on the disk, you need to delete
existing partition next to the selected drive to generate unallocated space, and
then perform partition extending. To extend C drive in Windows 7 without formatting,
it is a wise move to choose another powerful tool.
Resize partition Windows 7 without losing data free
AOMEI Partition Assistant Standard is free
partition manager that allows you to change partition size in Windows 7 effectively
without data loss. If there is no unallocated space adjacent, you can use “Merge
Partitions” to add it to target partition. You can also extend partition when the
unallocated space is in front of the target partition, i.e. extend to both right
side and left side. Free download to have a
try.
Firstly, right-click C to choose option "Resize Partition".

Secondly, at this Move and Resize Partition window, lay the mouse to
small circle in the right or left until it becomes a double-headed arrow. No matter
which position you put, just drag it oppositely. After that, select "OK".
If you want to move this partition, tick the box in front of “I need to move this
partition”.

Thirdly, please check the change on C drive and commit the task by
clicking "Apply". Then, another window pops up. Click "Proceed"
to take effect the change.

Tips: It will take several minutes and a reboot is required.
After shrinking C drive in Windows 7, you can add it to D drive or use it to create a
new partition. To add the unallocated space to D drive, please refer to how to
combine two unallocated space which shows combine not only two unallocated
space but also unallocated space and existing partition. To create new partition,
please turn to following part.
How to create partition from unallocated space?
1. Right click the unallocated space to choose "Create Partition".
2. In the display window, fulfill the exact information of the new volume. Moving
and resizing are permitted in the process. If you want to name or select the new
volume's type, click "Advanced" button. It will give you more
details. Then, click "OK".

3. Preview the changes on the disk. Then, click "Apply" and "Proceed"
to realize the task. After that, you will see the progress window below, which
shows the change is being executed.

Tips: The progress window above is the same as resize Windows 7
partition free. Both of the operations do not need to reboot computer. How
convenient the tool is!
To sum up, the procedures above is so easy. As we all know, the Disk Management in
Windows OS has so many limitations, even for advanced Windows 10/7/8/8.1/Vista OS.
As covered before, AOMEI Partition Assistant is also capable of many other things.
For instance, you can create a bootable
USB drive and operate all tasks under Windows PE mode. Thus, the third party
tool—Partition Assistant, is extremely essential for you.