Zero-lenght partition

[Andrea Carotti]

Hi all,
    while rebooting after an hard shutdown (a power supply problem) having 
the autofsck enabled on boot, I receive this error:
" fsck.ext3: Attempt to read block from filesystem resulted in short
read while trying to open /dev/hda2
Could this be a zero-length partition? "

Could anyone tell me the best procedure to fix this? I'm a bit scared 
:-|....
TNX
Andrea