The DD command we mentioned here is part of the GNU File Utilities.  It’s one of the original Unix utilities and should be in everyone’s toolbox. It’s widely used to write disk headers, boot records, and similar system data areas. Misuse of dd has probably trashed many hard disks and [...]

After a long time running, your file systems may bacome rotted. There would be so many abnormal files, like pipes, sockets and damaged links, etc. But no warries please, they are only  file system with some common isssues, what you need to do are often 3 steps: