Good day and thanks for your help. Most every external HDD is USB 2.0, and backward compatible with USB 1.1. My friend has an old Gateway Windows 98 first edition that's ready to die. I'm trying to find an external HDD that will not only work with 98 first edition, but also USB 1.0. Any suggestions? She wants to wait for Vista before upgrading, but I'm not sure she has that much time left in the current computer. Thanks.