Disk Management built-in Windows 7 also called Local Disk Manager which provides an
impressive graphical interface mapping to your local hard disks and partitions. It
not only displays the details of your disks and partitions which can help you
diagnose disk and partition problem, but also it can be used for performing
disk-related tasks such as resizing partition (extending system partition or
shrinking partition), creating, formatting, and deleting partitions, etc.
Benefit of Windows 7 Disk Partition Tool
The easiest way to access Windows 7 Disk Management:
Right click "Computer"→ select
"Manage" → Get the new control panel, open "Storage"
and choose "Disk Management" in submenu, and then you
will get the following Disk Management:

Other three ways to get Windows Disk Management in Windows 7
Click "Start" → "Control Panel"
→ "System and Security" → "Administrative
Tools", then double-click the "Computer
Management" → "Disk Management"
Click "Start". Type
"diskmgmt.msc" in the text box and then click
"Enter"
Click "Start" → "Control Panel",
search "partition" in the Control Panel, and then
choose Create and Format Hard Disk Partitions.
Compared with Windows XP/2000/2003 Disk Management, Windows 7 Disk Management has
much superiority because it could resize partition at least. Windows XP/2000/2003
Disk Management only could reach simpler partition creation operation some other
basic operations. However, if you are familiar with Windows Vista or 2008 Disk
Management, you will know much limitations and Windows 7 Disk Management also
remained.
Extend system partition grayed out
There are a few reasons thta can cause extend volume grayed out. For example,
Although we see there is unallocated space, extending system partition option is
grayed out because between C: system partition and the unallocated space, there
is F: partition.
If your hard drive is initialized as MBR partition style, you cannot add free
space to a primary partition, nor can you add unallocated space to a logical
partition.

Create partition errors
Create partition by built-in Windows 7 Disk Management, sometimes we will get
following two messages:


In most situations, Disk Management in Windows 7 can’t shrink a partition to a minimum.Because Windows only allows four primary partitions at most.
Solution:Delete one or more primary partitions to re-create partitions
Such limitations, how we could manage hard disk well with Disk Management Windows 7?
The answer is turning best partition magic pro alternative for help - AOMEI Partition Assistant Professional (PA Pro). It has built three wizards and
powerful partition manager together which are used for simplifying and managing hard
disk well. Free Download AOMEI Partition
Assistant Professional Demo to make a comparison through
following form and try its magic:
Features | AOMEI Partition Assistant | Windows 7 Disk Management |
Resize NTFS Partition(Extend, Shrink) | √ | √ (limitation) |
Resize FAT Partition(Extend, Shrink) | √ | ╳ |
Move Partition | √ | ╳ |
Merge Partitions | √ | ╳ |
Allocate Free Space | √ | ╳ |
Convert Dynamic Disk to Basic | √ | ╳ |
Migrate OS to SSD | √ | ╳ |
Create Partition | √ | √ (limitation) |
Wipe Partitions/Disks | √ | ╳ |
Copy Partitions/Disks | √ | ╳ |
Convert FAT files system to NTFS | √ | ╳ |
Hide/Unhide/ Partitions | √ | ╳ |
Apart from above advantages, what’s more, all these operations can be easily
performed with AOMEI Partition Assistant Pro Edition eye-pleasing and simplistic
interface. You will be guided to realize all partition operations with ease.
Furthermore, all of the features can be supported by Windows 8.1, Windows8, Windows
7, Vista, XP and 2000.
To sum up, although you can use Disk Management to control your partitions, there are
limitations. What’s more, if you need to perform more advanced operations such as
allocate free space, convert dynamic disk to basic disk, migrate OS to SSD, the
built-in tool isn’t enough for you. Therefore, you may try the third party software:
AOMEI Partition Assistant Professional Edition.