Hi, I have just bought a Samsung 500GB SATA 5400rpm 8MB Cache Laptop Hard Drive and put it into my old MAC mini, the only problem is that the Disk Utility cannot see the drive at all. I have also tried df -hl but that cannot see it either. If I connect the drive to a Windows PC it says that I have to initialise the drive using an MBR or GUID Partitioning. I'm assuming that I have to use GUID partitioning for the MAC? But how do I do this inside Leopard? Do I have to take the drive out and initialise it using Windows? Once I manage to initialise it, will it appear in Disk utility so I can format it? Please Help! Thanks, Delboy.