rocktalkrock :
There is no max supported HDD storage limit for your motherboard, or any motherboard. Sata is just a connection between the HDD and your motherboards chipset. The only limits are how many storage devices you can connect to the Intel Z170 chipset (a Sata3 controller supporting 6 devices is built into the Intel chipset) and how fast data will flow through the Sata connection. In addition your motherboard has an add-on ASMedia controller chip which runs 2 extra Sata 6Gb/s ports.
it says 6 - Sata 3 ports on z170 chipset
https://ark.intel.com/products/90591/Intel-Z170-Chipset so in this case im only limited by windows 10 storage support ''However, if the disk was initialized to GPT, we can totally ignore the hard disk size limit, because it can be up to 9.4ZB or 9.4 billion terabytes even if the disk uses 512B sector'' previously i was thinkin there is some limit like for example max supported RAM size for my mobo is 64GB