Windows Server on VirtualBox using an existing virtual hard disk file

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Windows Server on VirtualBox using an existing virtual hard disk file

 

 

 

My original question is:

I'm using VirtualBox, after I create a Windows Server 2008r2 machine, I'm creating another Windows Server 2016 machine,

In the Hard Disk Step, can I choose Use an existing virtual hard disk file to use the vdi file of Windows Server 2008r2 to create the new Windows Server 2016 machine? Will it cause problem?

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And today I have new discovery, I create a CentOS virtual machine says Machine1, and for some reason I need to create a new one and remove the original one, so I right click on Machine1 and click remove > delete all files,

 

then when creating a new CentOS virtual machine says Machine2, I found the vdi file of Machine1 in fact not deleted, it's in C:\Users\YourUserName\VirtualBox VMs\Machine1, and in the creating step I click Use an existing virtual hard disk file , and after that the Machine2 is directly completely created, the reamaining setting steps are all skipped,

and the most amazing point is that, seems all information include username and password are all remain, that is  the user information of Machine1 is same as Machine2.

So I think the vdi file equals the whole state store the whole OS in it, so if you create a new machine and use a vdi file, the new machine will equal the OS state of that vdi file.