MSI GS60 2PC (2014 Model) SSD Upgrade

Feb 4, 2019
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My laptop shipped with a 128gb ssd and 1tb hdd. The SSD is obviously the boot drive (c drive) and the hdd is extra. Since I have an extra m.2 ssd slot, if I install another m.2 ssd will it expand the c drive or create another directory?

Thanks.