I recently purchased a 4GB external hard drive from Hitachi. It is a Travelstar 5400 RPM. My laptop is a Sony PCG-Z1WA running XP home. The drive worked fine for a couple of weeks. Today, I cant access that drive. It is not even listed under my computer. When I browse and type in e: my computer freezes and the programs become none responsive. I cant find the device on my device manager to delete and start over. I was plugging into the computer USB ports (which are low speed) but then inserted a 2.0 high speed card, to make the drive more efficient. I cant get the drive to work whether it is plugged into the high speed ports or not. Help! Paula