Please I hope someone can help, I have a 500 GB IOMEGA HD (formatted GUID as per instructions) attached to intel core duo mac, which until yesterday only held iphoto library and itunes library- and was working ok. Yesterday upgraded to Snow Leopard and on finishing install asked if I wanted to use external drive for time machine. Didn't really think about it and said yes - now when I open imac says there is a problem with external drive which cannot be repaired. I can see iphoto library on HD and also itunes library and backup. However the drive padlock is closed, the sharing and permissions are read and write. When I try to copy my iphoto library to a disk to save it gives the following error message could not scan "volumes/external Drive/iphoto library/metadata backup/photos/00....... Is there any way I can save my photos or do I need to visit the apple store? I hope someone can help.