"The operation you selected will convert the selected basic disk(s) to dynamic disk(s)."

maks kuznia

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Jan 4, 2017
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So basically I have a 2tb external HDD with 2 partitions. 1 partition is 1tb and the other is 800gb. The 1tb partition is almost full so I wanted to extend it. So what I did was I shrunk the 800gb partition so I would have a 488gb unallocated partition. But now when I try to extend my 1tb partition this message comes up.

"The operation you selected will convert the selected basic disk(s) to dynamic disk(s). If you convert the disk(s) to dynamic, you will not be able to start installed operation systems from any volume on the disk(s) (except the current boot volume). Are you sure you want to continue?"

Here's a screenshot of everything.
https://i.imgur.com/wUIe39m.png
 

maks kuznia

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Jan 4, 2017
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But why will it change to a dynamic disk and what's the difference between the two?
 
Besides better performance in Windows, a dynamic disk allows to make the changes (extend or shrink partition) you are performing and other tasks like creating volumes that cover multiple disks (spanned and striped volumes).
If you try to extend or shrink a partition on a basic disk it must not be formatted (raw) with a file system. Yours is already formatted with the NTFS file system.

 

maks kuznia

Commendable
Jan 4, 2017
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So there are no drawbacks to the dynamic disk?
 

That is not the answer to my question.
Even if you manually selected the SSD, I would like to know if both disk were connected during the installation process.

 

maks kuznia

Commendable
Jan 4, 2017
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That is what I meant. Only the SSD was connected.
 
Terminate any app that could be using the disk (scanners, antivirus, etc).
Using command line, instead of the GUI, to convert to dynamic disk may work.

Open cmd as admin.
Type diskpart and hit enter.
Type list disk and hit enter. Make note of the disk number you want to convert to dynamic disk. Yours is disk 1.
Type select disk 1 and hit enter. You will see "Disk 1 is now the selected disk"
Type convert dynamic and hit enter. Wait for the process to finish.
Type exit and hit enter then close the CMD window.
 

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