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When a computer hard drive crashes, data recovery is the only option for restoring the files lost on the drive. Nearly every computer owner has faced hard-drive failure at some point in their computer using days, but that does not mean they fully understand the dynamics involved in "lost" data. There are 4 tips that can help any computer user better recover those lost files.
#1 - Backup Before Failure Occurs
Saving a backup copy of the files on your computer on a daily or weekly basis can help alleviate any problems associated with hard drive failure. If backups are current, the drive will simply need to be replaced and the information loaded onto the new hdd.
#2 - Treat Your Computer Right
Personal and business computers should be turned off when they are not in use. This gives the hard drive time to rest and cool down. Think of the drive as having only 1000 credits. The credits are only used when the drive in working, so turning off the computer will help the drive to last longer.
#3 - Seek Help at the First Signs of Failure
Many hard drives will start making weird noises when they are failing. These noises could last for months and the user often feels they are just regular, common computer noises. On the contrary, they are a signal to get the computer to a data recovery or hard drive repair specialist before the crash happens.
#4 - Choose a Data Recovery Software Wisely
There are plenty of data recovery software programs out there that will harm the hard drive more than help it. These software programs often come with NO guarantee which is the opposite of hard-drive data recovery experts. If the software loses the data or cannot find the information on the drive, the money is already spent and the drive could be damaged beyond repair.

Source: http://ezinearticles.com/?4-Tips-For-Safe-Data-Recovery&id=3180335