Rescue Data from External Hard Drive on Mac Mountain Lion is an important issue as you may have saved lots of useful data in external hard drive when the Mac hard drive is full. Mac Mountain Lion supports various external hard drives with different storage capacity. You just have to connect it through USB port, however there are several cases in which the stored data in the external hard drive can get lost and you must rescue data from external hard drive on Mac Mountain Lion. The reason why the data got deleted or corrupted are ejection of USB cable while the transfer of data is in progress, there is and power failure or surge, you may have formatted the external hard drive, virus attack etc. You can rescue data from external hard drive on Mac Mountain Lion by using any backup but if it is not available then there is Mac data recovery software that can restore all your data from the external drive. You just need to install the software and then follow three simple steps scan, preview, restore. You can rescue data from external hard drive on Mac Mountain Lion without any difficulty.