Long story short: OK, I have both a mac (primary) and a pc I keep around. The PC was running XP Pro and my son gave me a legit Vista Home Premium so I upgraded. Unfortunately, a lot of my graphics files from Corel/Visio are on the 2nd HDD in the PC which for some reason is fully detected in BIOS and Device Manager, but it is "offline" and there are no options at that point to bring it online. A friend lent me his eSata dock and I pulled the drive, loaded it, and plugged the USB into the mac. Said the drive cannot be read but do I want to eject or initialize? What exactly does initialize mean? I don't want to lose the data on the drive (Seagate Barracuda 320 GB 7200 rpm).