Download something like Everest Home click here or SIW click here and look up the HDD part number (under Physical Drives in Everest). Put the part number into Google and identify the specification of your drive.
To see if your motherboard will take a SATA II HDD do the same for this and again look at the specification. If the mobo is fairly recent, it is almost certain to take SATA II.
Also read this click here