Mainak_5 :
can i use 2hdds instead of 1hdd and 1ssd . i will be using this pc for lightroom 6 and photoshop cc. i have a i3 4130 processor and gigabyte ga-h81m-s1 motherboard.
Sure. The OS does not know or care.
But as above, I would not build a main use PC today
without an SSD for the OS and applications.