/etc/filesystems

On RedHat, CentOS, and probably other RPM-based distributions, the /etc/filesystems file lists the filesystems that are known to the system, i.e. those filesystems that can be mounted without specifying the filesystem type. The contents of that file in a minimal CentOS installation are:

[[email protected] ~]# cat /etc/filesystems
ext4
ext3
ext2
nodev proc
nodev devpts
iso9660
vfat
hfs
hfsplus