In some cases, we cannot open a hard drive due to a hardware problem. There might be some mechanical error with the actuator arm. In this situation, you didn’t lose your data at all, but you just cannot find it due to this hard disk mechanical problem. However, data loss may also occur due to a software problem. If a file is fragmented, the information is stored in multiple clusters on the hard disk drive, and it will take more time for the computer to read it. Thus, it can make it easier if you can defrag your hard disk every week or month. You can use WiseRecovery to open or recover files. http://tiny.cc/f6hmrx. Download and install it, then perform a quick scan to see recoverable files and can restore them whenever in need.