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How to identify possible hard disk failure based on sounds

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 

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How to find firmware or boot ROM version in Mac OS X

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}'

How to decrypt the Filevault encrypted volume using Recovery HD ?

There might be a time where you want decrypt the FileVault encrypted mac, but you are facing issues in logging into Mac to perform decryption using system preferences. In such cases the following steps will help you in decrypting the disk using Recovery HD. Reboot the Mac, Go to recovery HD partition of the system. (To start your computer from Recovery, restart your Mac and hold down the Command and R keys at startup.)Open Terminal application from Utilities -> Application. First will need to identify the Logical Volume UUID of the encrypted drive using the diskutil corestorage list command: diskutil corestorage list

      4.  Once you have the UUID of the logical volume as shown in above picture, you can then either             unlock or decrypt the encrypted volume using the following commands.
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