How to remove a System Reserved partition on a data drive?

gregrocker said:

The warning might have been generated by the presence of the Active flag which signals which partition is to be bootable, but it wasn't independently bootable or there would be a System flag as well.

About the system flag... "System" just indicates that this is the partition from which you started. If you change the boot order in bios then another active partition (with boot files) will become the system partition.

Just for anyone else who may find this thread useful, this is what I did:

Opened command prompt
Elevated Command Prompt

Cleaned disk
Disk - Clean and Clean All with Diskpart Command

Initialized as MBR Partition Style (as it is a Western Digital Disk and this is what they recommended)
How to initialize or write a signature to a secondary hard drive or Solid State drive in Windows (8, 7, Vista, XP)

Created and formatted the volume
Partition or Volume - Create New

Hope this is useful for others and thanks to everyone for their kind advice.
Cheers
Harley

Thanks for reporting back, Harley. If there's nothing else then you can mark thread Solved at top.