MTAB(5) File Formats Manual MTAB(5)
mtab - mounted file system table
Mtab resides in directory /etc and contains a table of devices mounted
by the mount command. Umount removes entries.
Each entry is 64 bytes long; the first 32 are the null-padded name of
the place where the special file is mounted; the second 32 are the
null-padded name of the special file. The special file has all its
directories stripped away; that is, everything through the last `/' is
This table is present only so people can look at it. It does not mat-
ter to mount if there are duplicated entries nor to umount if a name
cannot be found.