How do I reformat a ZFS external HDD?

Hi. I recently tried rebuilding an old PC as a FreeNAS device, including 2 external hard drives.  Long story short - it was a disaster!  I have managed to recover the PC back to Windows but I'm struggling with the HDDs.  I can see the disks
in Computer Management but right-clicking only gives me the option to convert to a dynamic disk.  How do I get these back to NTFS?  All the data is safely store elsewhere so I don't need to preserve anything currently on the disks.  Any help
or advice will be greatly appreciated!  Thanks.

Hi,
As I known, to control this FreeNAS device, we have to remote its IP on IE interface. We cannot do many operation in remote Mode. 
Since we know little about FreeNAS, I suggest contacting their support for further help.
Meanwhile, if the FreeNAS device besides your hands, we may have to start it via Windows 7 disc or usb drive and reinstall it if we can change the BIOS settings about boot order for a try.
You may also capture a screenshot of the computer management for further research.
Hope it helps.
Regards,
Blair Deng
Blair Deng
TechNet Community Support

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