Dell Inspiron 3847 - 1x SSD, 2x HDD, 1x ODD

I am using a Dell Inspiron 3847. To the 1TB HDD and the ODD that came in the box I would like to add a second HDD of equal size or bigger and one SSD - so a total of 1x SSD, 2x HDD, 1x ODD.

The MB's SATA ports are marked SATA 0 and SATA 1 for HDD and SATA 2 and SATA 3 for ODD. 

Can one of the SATA ports marked/designated for ODD handle a HDD instead?

What designates a SATA port as HDD or ODD? Transfer rate?  Assuming the SSD runs of SATA 0 or 1 , how bad would it be if one of the HDD would run of SATA 2 or 3?

Thanks, Patrick

Thanks, Patrick