HD Spy is a hard disk tool on Mac OS X, you can view your hard disk basic information and health(S.M.A.R.T.) information. Basic information include: Capacity, Temperature, Power on hours, Modal, Serial Number, Firmware, Rotate Count, BSD Name, Partitions, etc. Health information include: Reallocation sectors count, Current pending sector count, Offline uncorrectable sector count and other S.M.A.R.T. data.