Are you unable to mount your Linux hard drive volume? The problem could be due to corruption the Linux hard drive data structures. To sort out such problems, Linux provides fsck utility. It is a command-line utility, which checks integrity and consistency of Linux file system, finds errors, and tries to fix them. However, in case if you run this utility on a mounted or online file system, you may come across catastrophic data loss situations. At this point, you need to carry out Linux Data Recovery to get your valuable data back.