I think the hard drive (10GB) on my iMac DV 400 is failing. (Getting a high-pitched whine, it goes off at sleep, so it can't be the monitor). It will cost less than $70 to replace it and I'd like to hold on to this Mac for general- purpose use. The drive is a Maxtor, but the specific model (91020U3) isn't available anymore. Can anyone recommend a cheap, low-capacity alternative? Thanks!