Windows 10 need help extending a newly installed hard drive

I have a new HP Omen laptop that I just installed a new 1 TB PCIe NVMe M.2 SSD hard drive.
The laptop came with a 128 GB PCIe NVMe M.2 SSD  (which I swapped out) and a 1 TB 7200 RPM SATA HDD which I left alone.

I am a bit of a novice on this so I am confused with what to do next.  Windows does not see the bigger drive and so it is all shown in Computer Managment as 'unallocated space'.

It seems to me on laptops where i had done something similar in the past I was just able to right click the main area, select 'extend' and follow the prompts.

However, extend is greyed-out when I try that?   Help!
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FOXActive Directory/Exchange EngineerCommented:
You should be able to right-click on the installed drive and extend volume

ref link:
snyperjAuthor Commented:
As I said, it's greyed out.
Thomas Zucker-ScharffSolution GuideCommented:
From the image, it looks like you will have to first move the recovery partition.  Normally the partitions need to be next to each other in order to extend.
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Devin BeckerIdentity Management and SecurityCommented:

Commonly the problem is the partition in between the partition you are trying to extend, and your allocated space(in this situation your Windows RE partition), which if you right click, you can probably extend. If this is the case you will likely have to delete this partition in order to extend you C: partition.

Try to see if extend is still greyed out when right clicking the Windows RE partition.

Hope this helps,

Devin Becker
snyperjAuthor Commented:
Ugh..extend is not even an option when I right click the Windows RE partition.  What is a Windows RE Partition????  I would delete it but I don't even know what it is, so I am afraid to.
Devin BeckerIdentity Management and SecurityCommented:
Windows RE, is a Windows recovery environment partition.

I would try and look into a third party application like EaseUS to extend the drive since it seems that windows is not playing nice with it.

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snyperjAuthor Commented:
Thanks, that is exactly what I did.  I downloaded partition freeware and completed the merge in about 1 min.  :)
Devin BeckerIdentity Management and SecurityCommented:
If only windows had made it that easy...

Glad you got it taken care of.


Devin Becker
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