In case you haven't completely given up you might make sure you have the drives plugged in the the correct location on the IDE cable.
Connecting Your Hard Drives
40 Wire Cables
On the slower older 40-wire ATA cables, the Master device, usually a CD-ROM or CD-ROM recorder/burner still goes on the END, but you need to set the jumpers as Slave. Did you ever buy a new CDROM or CDROM burner, open up the package and see that the jumper was already on the Slave position? It's that way for a reason. This is true even if you don't have a hard drive in the Master position. The Master for 40-wire cables goes on the the Middle connector. Only older computers (the AT type) have a problem here, and again, you should read the manual that came with the motherboard or contact the maker of the system. You could try it as a Master and it may work but that's not the way it should be. If you want to use the cable select with the older drive on a 40-wire cable, you'll have to consult the maker of the drive for the instructions. My sources tell me that there was a loose standard to put the Master drive on the end of the 40-wire cable and the Slave in the middle but that was a very loose standard. Makers I spoke to (IBM, Maxtor, etc.) informed me that the user should set the drive using the Master and Slave jumpers on the hard drive, placing the Master in the middle and the Slave on the end.
On the ATA66/100/133 standard 80-wire cable, the Master hard drive or your boot hard drive goes on the END of the cable. This is true whether or not you use the Master/Slave style or the Cable Select style.
some motherboards will not recognize a master/slave drive if the slave is placed at the end
I have the DH20A4P as one of my drives in my Vista computer . Vista had the needed drivers already. I guess if Windows 7 doesn't have the drivers for this drive Vista does. You could create a slipstream Windows 7 disc with the Vista drivers for CD/DVD drives.
I have a hard time believing Windows 7 doesn't have them somewhere. That is why I'm going along with deanwitty & posted additional IDE cable info.