Chkdsk performs a couple of functions, depending on how itâs run: 1  Chkdskâs basic function is to scan the integrity of the file system and file system metadata on a disk volume and fix any logical file system errors that it finds. 2  Chkdsk can also optionally scan every sector on a disk volume looking for bad sectors. Bad sectors come in two forms: soft bad sectors, that can occur when data is written badly, and hard bad sectors that can occur because of physical damage to the disk.
The rank of colonel is typically above the rank of lieutenant colonel. The rank above colonel is typically called brigadier, brigade general or brigadier general. Equivalent naval ranks may be called captain or ship-of-the-line captain. In the Commonwealth air force rank system, the equivalent rank is group captain.
A commander in the Army is a commanding officer or team leader. Another way to look at the term is that the rank of commander in the Navy or Coast Guard is the equivalent of a lieutenant colonel in the Army. These field-grade Army officers command a battalion, a fighting or support force numbering between 300 and 1,000 men and women. Noted by the silver oak leaves on their shoulders, lieutenant colonels are two steps below general officer status.