async 

   use asynchronous file I/O

atime 

   Update the inode access time for every access

auto 

   mount when -a option is used

defaults 

   set rw, suid, dev, exec, auto, nouser and async option

nosuid 

   don't allow programs stored on the filesystem to run setuid or setgid 

nouser 

   only root can mount the filesystem

sync 

   use synchronous filesystem I/O

user 

   permit ordinary users to mount the filesystem(s)

dev 

   allow character devices, and block special devices on the filesystem(s)

nodev 

   don't allow character devices, and block special devices on the filesystem(s)

_netdev 

   indicates a filesystem that depends on the network

remount 

   remount a mounted filesystem with new options or parameters attached

ro 

   mount the said filesystem as Read-only type

rw 

   mount the said filesystem as Read / Write mode (client can edit, create and delete files)