What am I overlooking? New Seagate ST3500641A-RK (500GB bare Ultra ATA/100) in an external USB enclosure. OS X Disk Utility (Tiger and Leopard) fault with an error message in the log: "Partition failed for disk ST350064 1A Media Input/output error Partition complete. error with partition Input/output error" The Apple machines are an old Mini Mac and a new MBP both with Leopard. I booted the MBP to an external copy of Tiger and had the same Disk Utility result. While I can move the drive over to an XP machine and partition and do a NTFS format; where the drive is a-okay. I was intending this drive to be my "TM" drive, so I would really like to get this 500GB drive on line. Suggestions? Thank you, Neil.