We can anticipate the hard disk failure based on the different hard disk sounds it is making and we can backup our data before hard disk completely becomes unusable. The datacent.com has collated various hard disk sounds(noise) to identify the possible hard disk failure by listening to the noise hard disk creates. Various noise can be heard here
Firmware and boot ROM version of your mac can be found in two ways. Way 1 : 1. From "Apple" menu , choose "About This Mac" menu item. 2. Click " More Info " to open "System Profiler" application. 3. Under Contents -> Select Hardware Tree item. On the right side panel Under hardware overview section, we can see Boot ROM Version and SMC (Firmware) Version. Way 2 : Run the below command in terminal to get boot ROM version and SMC(firmware) version : $ system_profiler SPHardwareDataType | grep -i "Version" | awk -F ':' '{print $1 $2}'