File system verification

Inconsistencies can occur in file systems when the system is stopped while file systems remained mounted or when a disk is damaged. In such circumstances, it is important to verify file systems before mounting them.

Also verify your file systems in the following circumstances:

• After a malfunction; for example, if a user cannot change directories to a directory that has that user's permissions (uid)
• Before backing up file systems to prevent errors and possible restoration problems
• At installation or system boot to make sure that there are no operating system file errors