Mislaid disk space

I have a 40Gb external LaCie USB hard drive, which until recently used to contain all my data. I have now bought a 300gb internal drive to move everything onto. But having moved some of the stuff over, for various reasons I have now mucked up my debian install and want to start afresh.

But, for some reason when I deleted my iTunes music library off the external drive, it doesn't seem to quite have gone properly... weirdly the drive still shows as full when running `df` but from my windows installation (on a different HD) it shows as having 16G free space...? The iTunes dir is no longer being listed on the drive, but it still seems to be taking up space.

Which is inconvenient as I now have a large tar archive of my home directory (containing the music) which I can't back up to reinstall the OS. So any ideas on what's going on here and if/how I can reclaim this free space, preferably without reformatting the drive (it still has quite a bit of important stuff on).

Thanks!

P.S. df has this to say:

Filesystem            Size  Used Avail Use% Mounted on

/dev/hdb1             250M   88M  149M  38% /

tmpfs                 252M     0  252M   0% /dev/shm

/dev/hdb9             220G   29G  181G  14% /home
/dev/hdb8             361M   69M  273M  20% /tmp
/dev/hdb5             4.6G  2.8G  1.6G  64% /usr
/dev/hdb6             2.8G  1.1G  1.6G  40% /var
/dev/sda1              38G   36G  1.6G  96% /media/sda1

-- 
Adam Gray
"Life + self-doubt = peace"
        -- Jan Buttinger

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