WAV file

I am using WAV to rip my CDs with error correction. I periodically convert all WAV files to Apple Lossless so that they are smaller on my Ipod. I use WAV in order to have bit perfect copies, and in case I ever want to use playback software other than Itunes. I have several hundred CDs stored in both WAV and Apple Lossless on an external hard drive. Question: when I copied the hard drive to a second hard drive by dragging and dropping in XP (via right click Explore), most of my WAV files lost artist and album names. How can I back up and keep these "metadata?"