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Normally, there are two kinds of disk failure. The first one is physical failure; this failure can be minimized by copying all the data in the other hard disk. Here, there is 90 percent chance of the data recovery from the used crashed hard disk. These were some of the processes to get complete and unaffected data from the crashed hard disk. You can get the information about more processes through internet. Different websites contain the review and the queries of computer users that are sort out by technicians. So, there is heaps of information to gain from internet as well.
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Operating systems like Windows can be conveniently restored by using the System Restore utility. There are number of data recovery software available too that can help your in retrieving your data from a crashed hard disk. However, beware of the cheap data recovery program which may completely delete the data from your hard disk.

It is always best to avoid this mess by making back ups at least once in a weak. If there is some very important information stores on your hard disk, backup everyday. Backup can be either be done on CDs or files can be uploaded to a server.

So saving yourself from the risk of a crashed hard disk is the best option. However, if your hard disk does crash, there are data recovery software and data recovery firms that would come to your rescue.