We help IT Professionals succeed at work.

How do I increase the size of the C drive?

I just replaced a smaller SSD with a larger one that now has unused space.   How do I add this space to the C partition?
Comment
Watch Question

Dr. KlahnPrincipal Software Engineer

Commented:
This cannot be done safely with Windows running from the partition that will be resized.

There are two choices:

a) Make a bootable USB drive with the drive cloning software of your choice.  Shut down the system and attach the new drive.  Boot from the USB drive.  Clone to the new drive.  Shut down, remove the bootable USB drive, remove the old drive, boot to BIOS, set the BIOS to boot from the new drive.

b) Take both drives to another system and attach them to the system.  Use any Windows drive cloning software.  Clone to the new drive.  Shut down, remove both drives, remove the old drive from the original system, install the new drive, boot to BIOS, set the BIOS to boot from the new drive.
AlexA lack of information provides a lack of a decent solution.

Commented:
This cannot be done safely with Windows running from the partition that will be resized.


Yes it can. Launch diskmgmt.msc and then shrink the C:\ by right clicking and shrink. It's windows 10, no need to faf about with boot disks.


Regards

Alex

AlexA lack of information provides a lack of a decent solution.

Commented:

Oh or you can expand it, either way.

IT Manager
Distinguished Expert 2019
Commented:
You can download and install MiniTool Partition Wizard to do what you want.

https://www.partitionwizard.com/

Commented:

Better do it outside Windows, so use this instead:   https://www.paragon-software.com/free/pm-express/ 

And after install, create the boot medium.   

Distinguished Expert 2019

Commented:

It's done safely within windows. And you have a backup, don't you?

AlexA lack of information provides a lack of a decent solution.

Commented:

It makes zero difference if it's done within windows or not, it's not 1999 it's 2020, Operating systems are MORE than capable of shrinking or increasing disks due to the File Allocation table that they use. I.E ExFAT, NTFS etc etc.

Jackie Man IT Manager
Distinguished Expert 2019

Commented:
Agreed.

But if there is system recovery partition next to C partition, you cannot use the built-in disk management utility to do the task.
Distinguished Expert 2019

Commented:

Yep, if you disk layout is non-standard, then you are right, Jackie Man.

Author

Commented:
I used MiniTool Partition Wizard.   That seemed to work fine.   I am attaching the snips before and after.Before MiniToolAfter MiniTool
Distinguished Expert 2019

Commented:

Yes, that was a non-standard layout which needed 3rd party tools.

Author

Commented:
Thanks to all contributors.