the motherboard manual should explain which, if any, SATA ports are affected by other connected devices. and what speeds they are all rated at.
how many does the board have available?
one quick test you could do to determine if a SATA speed limitation is taking place to a certain port(s)
is to test the drive on other ports.
also possible that Crucial has specific drivers for this disk that may help with it's proper recognition in Device Manager.
have you also checked that the latest motherboard system drivers are installed?