ReFS - Have you heard about it?
Nope... I did not too, until recently. And I was quite puzzled by it.
So, back in Windows 8.0, Microsoft decided to allow desktop users to RAID in their computers without the need of a raid card. Yes. You heard me. No Raid Card.
Typically, if you need a Huge drive for your use, you will need to have an attached drive for your nonsense but with ReFS, the limit is gone. You can map them just as how LVM in Linux a virtual way.
But Hey.. there is something I found more sinister:
You can add SSD mixed type drives into the array.
You can add External HDD drives into the array!
You can map drives attached using your eSATA or other adaptations too...
So how it works...I doubt this may be true but here goes
E:\----> SSD (critical) ---> SAS ---> SATA---> External Drive for cold data
But hey.. thats far better than my Synology Drives