Confused about fsck

Colin Law clanlaw at
Wed Dec 14 16:01:16 UTC 2011

Every so often my system checks my disk on bootup.  I thought that
this was done using fsck.  It takes a couple of minutes to do the

I have an external 250GB USB disk that I wish to check.  I plug in the
disk and check it is not mounted (it appears as /dev/sdb1) and run
sudo fsck /dev/sdb1
This returns immediately saying that the disk is clean, whereas I had
expected it to take a little while checking things, so it does not
seem to be doing the same things that the check on startup does on the
built in disk.  I can't see any options on fsck to specify what is to
be checked.  Can someone explain what is going on?


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