Need to fix badly-mounted partition.

[Dotan Cohen]

When I fired up qtparted to do some work on my ~/music partition, I
get this in the console:
Error: Invalid argument during seek for read on /dev/hda
Error: Filesystem was not cleanly unmounted!  You should e2fsck. 
Modifying an unclean filesystem could cause severe corruption.
Error: Invalid argument during seek for read on /dev/hda

I don't want to screw anything up, so what would be the advisable
course of action? Thank you in advance.

Dotan Cohen
http://technology-sleuth.com/question/how_can_i_be_safe_online.html