if you don't have a gpu or a cpu to mine with....at least you have a hard drive and guess what....you can mine with it....you can start from 3gb if you want....one of the most important currencies that is being mined by hard drives is BURST you can find info here....https://www.cryptocompare.com/coins/burst/overview
but is it like mining with gpu or not?...or is it worth it at all?....that i don't know
i just found out about it and i'm in the process of trying it....i just wanted to share what i've learned....i don't know if it'll benefit you or not....but i hope it will
Please upvote for me and thank you