how to partition c drive in windows 10

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how to partition c drive in windows 10

How to partition c drive in windows 10 without formatting such as extend c drive and shrink C drive using Disk Management, Diskpart or 3rd party soft.

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  • Domain - www.aomeitech.com

  • Category - Computer Basics/Computer Basics

  • Submitted By - Helen Dai

  • Submitted on - 2018-02-05 08:40:30

Description

This article also applies to Windows 8, Windows 7 and even Windows XP on:

How to partition C drive in Windows 8 without formatting

How to partition C drive in Windows 7 without formatting

How to partition C drive in Windows XP without formatting

Why Need to Partition C Drive Windows 10?
The most common reason is the low disk space problem. After using computer for a long time, some users may find their machine replies slower and slower. Some may get a message says “You are running out of disk space on system (C:) To free space on this drive by deleting old or unnecessary files, click here…” Especially, when old Windows users upgrade their OS to the newest Windows 10, the C partition is more likely to lack of free space.

In such situation, or some other situations, users need to resize partition C Windows 10.

How to Partition C Drive in Windows 10 with Diskpart
First of all, search “cmd” in Search Windows to open command prompt. Then, input “Diskpart” in command prompt window to open Diskpart. Or, directly search “Diskpart” in in Search Windows to find it.

Diskpart extend C drive partition Windows 10

To extend C drive partition Windows 10 with Diskpart, there must be an unallocated space locates very behind partition C for usual basic disk partition. If there is not, you can create some by deleting the partition right behind C drive.

Notes:

Make a backup of crucial data of the partition behind drive C before deleting.

If its dynamic volume, there must be unallocated space in the computer, but the unallocated space does not have to be continuous to C partition.

Steps:

1. Type “list volume” to list all volumes in the computer.

List Volume

2. Key in “select volume c” or “select volume #” (replace “#” with the volume number of drive C; here is “0”) to make C volume active.

Select Volume C

Select Volume 0

3. Type "extend [size=m] [disk=n] [noerr]" to extend volume c to disk n of size m.

"size=m " specifies the size to be added into drive C in megabytes (MB). If do not specify a size, it will add all the next contiguous unallocated space to C partition.

"disk=n " determines the dynamic disk on which to extend the volume. Space equal to Disk n is allocated on the disk. If no disk is specified, the volume is extended on the current disk.

"noerr" is for scripting only. When an error is thrown, this parameter specifies that Diskpart continue to process commands as if the error did not occur. Without the noerr parameter, an error causes Diskpart to exit with an error code.

All above settings in the square brackets are unnecessary. You can only type "extend" to add all unallocated space into target volume.

Extend Volume C

Diskpart shrink volume C

Only a few users need to shrink partition C to extend other partitions. Shrink partition C in Diskpart is similar to extend function. The only difference is replace “extend” with “shrink”. You can also specify the size in MB to be shrunk using “desired=?”.

Shrink Volume C

Tip: You may failed shrinking for the unmovable files matter. If you encounter such problem, just decrease the size to be shrunk out and try again.

How to Partition C Drive in Windows 10 Using Disk Management (DM)?
Still, make sure there is unallocated space continuously behind C drive. Otherwise, the “Extend Volume” option is greyed.

Extend Volume Greyed out

Disk Management extend C partition Windows 10

1. Right click on C volume and select “Extend Volume”.

Extend C Volume

2. Confirm Extend Volume Wizard and go on.

Extend Volume Wizard

3. Select disks from which you want to take space from. You can only take space from the disk which volume C locates and it was automatically selected. Then, you can specify how much free space you plan to add into partition C. The maximum size is the size of the unallocated space.

Extend Volume Select Disks

4. Confirm the extension and click “Finish”. DM will complete this task in a few seconds.

Completing the Extend Volume Wizard

Extend C Volume Completed

Disk Management shrink volume C

Also, DM shrink C volume is very like DM extend volume C. Just right click C, choose “Shrink Volume” and continue with the guidance. Steps are just as clear as you can understand. Also, there are limitation caused by unmovable files.

How to Partition C Drive in Windows 10 without Formatting?
Just as mentioned above, resize partition C Windows 10 by system built in programs (Diskpart and DM) will both requires you to format/delete the drive that is right behind C. If you do not want to do so, you can make use of partition manager software like AOMEI Partition Assistant (PA) to partition C drive Windows 10.

How to partition a hard drive in Windows 10 without losing data? Download, install and launch AOMEI Partition Assistant in your computer.

Partition Assistant extend C drive partition Windows 10

If there is no unallocated space, PA can increase C drive space easily.

1. In its main window, click “Extend Partition Wizard”.

Extend Partition Wizard

2. Keep the default selection “Extend system partition”.

Extend System Partition

3. It can extend system partition without losing data and restart computer.

Extend System Partition Confirm

4. Select the partitions that you would like to take space from. Partitions which have much free space is recommended.

Select Partitions to Take Space from

5. Specify how much free space you want to take to C drive by either dragging the slice bar or inputting number.

Specify Size to be Increased

6. This is the summary of the operations going to be carried out to complete resize partition C Windows 10. Confirm it and click “Proceed” to start.

Confirm and Proceed Extension

Partition Assistant shrink C drive partition Windows 10

Right click drive C and select “Resize Partition”. Drag the graphic bar to control how much space to cut off from partition C. Preview the result and click “Apply” to carry out the operation.

Shrink C Partition

Compare Diskpart, Disk Management and AOMEI Partition Assistant
How to partition c drive in windows 10 after installing? You can make use of system snap in Diskpart and Disk Management. There are also many third party programs under selection, such as AOMEI Partition Assistant. All the three methods can help you partition C drive Windows 10; yet, there are diffenences among them.


Diskpart

Disk Management

Partition Assistant

Extend partition

There must be unallocated space very behind target partition for basic disk partition.

There must be unallocated space very behind target partition for basic disk partition.

There is no need even for unallocated space.

Shrink partition

Can only shrink basic volumes that have no file system or use the NTFS file system.

Can’t shrink a partition beyond unmovable files point.

Can only shrink basic volumes that have no file system or use the NTFS file system.

Can’t shrink a partition beyond unmovable files point.

Can shrink nearly all kinds of partitions.

Can shrink as much free space as the partition has.

Create partition

Can only create partition on unallocated space.

Can only create partition on unallocated space.

Can create partition on both unallocated space and existing partitions.

Delete partition

Difficult for green hands.

Can’t preview the result.

Easy guides and can preview the result.

Format partition

Can’t convert partition larger than 32 GB to FAT32.

Can’t convert partition larger than 32 GB to FAT32.

Can convert partition up 2 TB to FAT32.

Convert GPT MBR

Can only convert empty disk between GPT and MBR.

Can only convert empty disk between GPT and MBR.

Can convert both empty and used disk between GPT and MBR.

Convert dynamic basic

Can only convert empty dynamic disk to basic.

Can only convert empty dynamic disk to basic.

Can convert both empty and used dynamic disk to basic.



Still, Partition Assistant has its own command line functions to partition C drive in Windows 10 without formatting.

Generally, you can rely on Windows built in tools to partition C Windows 10. When you encounter problems using Diskpart or Disk Management and can’t solve them; or, just want to resize partition C Windows 10 without limitations, just feel free to ask help for AOMEI Partition Assistant, an alternative to Disk Management and Diskpart.

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