EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended

[31 <borxa@email.com>]

¿Porque me sale este mensaje durante el inicio?

...
TCP: Hash tables configured (established 8192 bind 8192)
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
VFS: Mounted root (ext2 filesystem) readonly.
Freeing unused kernel memory: 192k freed
Adding Swap: 128512k swap-space (priority -1)
Real Time Clock Driver v1.10e
EXT2-fs warning: mounting unchecked fs, running e2fsck is 
recommended
NTFS driver v1.1.20 [Flags: R/W MODULE]
NTFS: Warning! NTFS volume version is Win2k+: Mounting 
read-only
parport0: PC-style at 0x378 (0x778) [PCSPP(,...)]
parport0: irq 7 detected
lp0: using parport0 (polling).
lp0: compatibility mode
...