How to extend C drive if C drive is in disk 1 and unallocated space is in disk 0 in windows 11?

Question

How to extend C drive if C drive is in disk 1 and unallocated space is in disk 0 in windows 11?

Priyadharshini K.P 20

Hi,

I need to extend my C drive space. But C drive is in disk 1 and unallocated space is in disk 0. In my laptop both windows 11 and Ubuntu installed. Find the attachment

User's image

If anyone knows, please help.

Thanks in advance

Neil D 34,325 Reputation points Volunteer Moderator

2026-06-07T09:34:44.81+00:00

As per AI you cannot extend space from one disk to another.

You can only extend partitions on one disk. You can extend New Volume (H:).

Did you have windows installed on Disk 0 at some time in the past given there are Recovery partitions there?
Priyadharshini K.P 20 Reputation points

2026-06-11T15:38:29.9233333+00:00

Thanks for reply @Neil D Yes I installed windows 10 in disk 0 (hard drive) which is very slow. Then I installed in SSD- disk 1 (windows 11)

Answer accepted by question author

DaveM121 935.7K Independent Advisor

It is not possible to extend a partition into a space on another physical drive.

Your PC has two separate drives, a 128GB SSD drive and a 1TB drive.

The 128GB SSD is barely large enough for the Windows 11 installation alone, and you have partitioned that SSD to install Linux on the second partition leaving 69.98GB for the Windows system drive, which is way too smally.

Really the only way to resolve this would be to uninstall the Linux distro on that Disk 1, then because Windows has very limited partitioning ability, you would need to use a 3rd party partitioning utility like the free version of AOMEI Partition Assistant to merge the C drive partition into the resulting space on Disk 1 after removing the Linux distro.

Priyadharshini K.P 20 Reputation points

2026-06-11T15:43:50.43+00:00

Thanks for reply @DaveM121

1 additional answer

Your answer

Neil D 34,325 Reputation points Volunteer Moderator

2026-06-07T09:34:44.81+00:00

As per AI you cannot extend space from one disk to another.

You can only extend partitions on one disk. You can extend New Volume (H:).

Did you have windows installed on Disk 0 at some time in the past given there are Recovery partitions there?
Priyadharshini K.P 20 Reputation points

2026-06-11T15:38:29.9233333+00:00

Thanks for reply @Neil D Yes I installed windows 10 in disk 0 (hard drive) which is very slow. Then I installed in SSD- disk 1 (windows 11)
Priyadharshini K.P 20 Reputation points

2026-06-11T15:43:50.43+00:00

Thanks for reply @DaveM121

Answer 1

Extending the C: drive on Disk 1 by using unallocated space on Disk 0 is not possible. Disk Management can only extend a volume into unallocated space that is on the same physical disk and is directly adjacent to that volume.

In the screenshot, C: is on Disk 1 and the unallocated space is on Disk 0, so the Extend Volume option for C: cannot use that space. To increase space for C:, the only supported options are:

Free or shrink space on Disk 1 so that unallocated space appears immediately to the right of C:, then extend C: into that space.
Move data (for example, user files, games, or other large data) from C: to partitions on Disk 0 and keep C: only for Windows and essential apps.

If there is already unallocated space on Disk 1 but it is not directly next to C:, any partitions between C: and that unallocated space must be moved or removed first before C: can be extended.

Always back up important data before changing partitions.

References: