Sometimes Hard drives go back the average life expectancy is around 5 years in that time you start having data clusters go back you start losing your data.. also sometimes someone makes a mistake and erases there entire hard drive deleted precious photos and other important data i can attempt to do a data recovery its never promised but there is a 15 dollar depost to run my software if it is successful you pay the remained for 50.00 which would be 35.00 minus the deposit this process can be very time consuming.