What is Diskpart?
DiskPart.exe is a partition manager tool from command line available in Windows 2000
and later version of Windows. As a replacement of Fdisk, this utility allows users
to manage disks, partitions or volumes from a command prompt or a script. Diskpart
can do more actions than Disk Management, Windows built-in partition tool with a
graphical user interface. Diskpart can be used to create, delete and resize
partitions or volumes. If you do not quite familiar with the command of diskpart,
you can use the command “help” to list all the available commands.
Disadvantages of Diskpart commands line
Although DiskPart can do many things regarding partition configuration and
management, one may look for a free diskpart command line alternative for the
disadvantages of diskpart listed below.
Only when there is adjacent unallocated space to its right of a partition, can
you extend a simple volume.
You can only shrink a partition from its right side, which means you need to
delete a partition to get unallocated space if you want to extend C: drive.
The system partition cannot be extended with diskpart.exe unless you boot from a
bootable disk to run the diskpart command.
Inappropriate operations may cause data loss and it is impossible to undo any
operations, so make sure that you backup
files and programs which are important, before you make any moves with
diskpart.
Actually things would be much easier if you use third party software to resize
partition.
Free alternative to Diskpart - AOMEI Partition Assistant
AOMEI Partition Assistant Standard is free partition software developed to manage the
drives installed in a computer including hard disk drives, optical disk drives,
flash drives, etc. one can move or resize partition by dragging and moving on the
disk map; one can convert disk between MBR and GPT without data loss; one can migrate OS to SSD or another HDD
without reinstalling system and applications; one can quickly partition a hard drive
with preset partition layout; one can find more functions that you need while using
it. What’s more, you can preview and cancel all the operation before applying, and
you can recover a mis-deleted partition by using Partition Recovery Wizard. At last
but not least, the concise graphical user interface of AOMEI Partition Assistant
displays as blow.

Besides, AOMEI Partition Assistant also provides partassist.exe utility allowing
users to manage hard disk partitions from command
prompt. You can use most of AOMEI Partition Assistant’s features from
command line, like resize/move partition without data loss, create/delete/format a
partition, initialize a disk, and rebuild MBR. It is really helpful for those who
like to use command prompt to manage multi-task instead of opening many windows.
For those extraordinary features, AOMEI Partition Assistant can be regarded as the
best free diskpart command line alternative. Now you can free download it and enjoy. If you want to
use advanced features such as Allocate Free Space, Convert Dynamic Disk to Basic,
try AOMEI Partition Assistant
Professional. Besides, if you're a server user, AOMEI Partition
Assistant Server is the best one.