Win 10 Pro, x64, 16gb, Platinum, Kontakt, UVI, etc
 
I just got a new HD for samples.  Clicked on format in Disk Mgmt.  Chose cluster size 64k.  Pressed Enter.
Started copying samples to the drive.  Just for curiosity I checked the properties.  It formatted the drive with ReFS!
I thought it would default to NTFS!
 
Anyone else done this?  Any problems/issues?
 
thx 

I haven't used it for samples but we use ReFS at work for our VM servers. Works well, no issues. Long term it is likely to replace NTFS, though as of yet it doesn't support the entire feature set.
 
Only real downside would be if you took the disk to an older Windows computer (as in Windows 7 or before) or to a Mac as they don't do ReFS. However if it is going to stay on modern Windows systems, it should work well.

Thx Sycraft!  So far I haven't run into any issues.

Here is an article on using It with Win 10 (and how to format an ReFS drive). 
There are some drawbacks noted.
https://www.windowscentral.com/how-use-resilient-file-system-refs-windows-10