I always have a pause at boot saying my filesystems are being checked (with a "press C to cancel" note, too). Actually (seeing boot.log) I think it's the / fs, which is located at /dev/sdb5

Several questions altoghether, here (hope this does not break any rule):

• Is this normal?
• Can I (or even should I) prevent this anyhow?
• According to boot.log (below) the fs does not seem to be 'clean', or, at least, it's in an state or condition that makes fsck always can it for errors for a while (just a few seconds). How can I fix it?

Edit: This is my boot.log:

fsck desde util-linux-ng 2.17.2
udevd[515]: can not read '/etc/udev/rules.d/z80_user.rules'


/dev/sdb5: 249045/32841728 ficheros (0.3% no contiguos), 20488485/131338752 bloques
init: ureadahead-other main process (1111) terminated with status 4

init: ureadahead-other main process (1116) terminated with status 4

Password:  * Starting AppArmor profiles       [160G Skipping profile in /etc/apparmor.d/disable: usr.bin.firefox

[154G[ OK ]
 * Setting sensors limits       [160G 
[154G[ OK ]

And this is dumpe2fs results for the filesystem being checked (well, the relevant part of the log):

Filesystem volume name:   <none>
Last mounted on:          /
Filesystem UUID:          42509bf9-f3e6-460a-8947-ec0f5c1fbcc8
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
Filesystem flags:         signed_directory_hash 
Default mount options:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              32841728
Block count:              131338752
Reserved block count:     6566937
Free blocks:              110850356
Free inodes:              32592701
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      992
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512
Flex block group size:    16
Filesystem created:       Fri Dec 10 19:44:15 2010
Last mount time:          Mon Feb 14 17:00:02 2011
Last write time:          Mon Feb 14 16:59:45 2011
Mount count:              1
Maximum mount count:      33
Last checked:             Mon Feb 14 16:59:45 2011
Check interval:           15552000 (6 months)
Next check after:         Sat Aug 13 17:59:45 2011
Lifetime writes:          331 GB
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:           256
Required extra isize:     28
Desired extra isize:      28
Journal inode:            8
First orphan inode:       28049496
Default directory hash:   half_md4
Directory Hash Seed:      d3d24459-514b-4413-b840-e970b766095b
Journal backup:           inode blocks
Journal features:         journal_incompat_revoke
Tamaño de fichero de transacciones:  128M
Journal length:           32768
Journal sequence:         0x0005e0c4
Journal start:            1

This is the relevant (at least I think this is the fs being checked) line in fstab:

#Entry for /dev/sdb5 :
UUID=42509bf9-f3e6-460a-8947-ec0f5c1fbcc8   /   ext4    errors=remount-ro   0   1