The Emachines etower 633ids has an IDE (PATA) drive control, but is a very old machine and had Windows Millennium installed on it originally. The Dell 2400 had a 640MB hard drive on it. If you are using the original operating system on the Emachines you will should be able to access the full drive.
You are about to answer a thread that has been inactive for more than 6 months. If you still wish to proceed, please ensure that your posting is original and does not duplicate or overlap any prior responses to this thread.