Windows 10: Transfer Win 10 from SSD - HDD

I bought a laptop from a pawn shop ( old one was dying ).
The "new" machine has very small SSD ( 110gb ) and I want to replace it with an HDD ( 1TB ) I recently purchased?
The following image is the output from a Powershell command I found here on the forums. It's a retail key, and I'm fairly certain it hasn't been used anywhere else.


TLDR: Can I use an existing key to reactivate windows on a separate set of hardware?
Would I be able to use the WIN 10 Key from the laptop I purchased?

:)

 

How to transfer files from SSD to HDD?

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Transfer free Windows 10 Preview 10240 from HDD to a new SSD

I've acquired the free Windows 10 licence from Insider program. I don't have neither Windows 7 or 8 licence. System is installed on my spare and slow HDD.

• Can I transfer or reinstall Windows 10 on my main HDD or on a new SSD? Will the system activate properly after clone or reinstall?
  
• Where I can find the product key which were given to the preview members?

 

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