Shrinking HD space on startup disk.

I've been using final cut pro at work for quite a while now, but I've been having a problem I haven't been able to fix yet, and I'm even not 100% if it's final cut the culprit.
Basically seems that my space on the Macintosh HD drive keeps dissapearing. I'm constantly freeing up space, and something seems to be taking it and I get the "startup disk is almost full" message. Just today, for example, I got it, freed 6 gigs of space by copying some old videos to an external HD, went back home for lunch, came back 2 hours later, and it was filled again. A couple of weeks ago I managed to get over 20 gigs free, and since then it filled up again, and I have no clue what's taking it.
One thing I've noticed is that if I select the whole contents of the HD and click on more information, it tells me I have about 150 gigs of files... but the drive itself tells me I have over 230 gigs used, and the cicle keeps repeating, me deleting stuff, space filling back up.
This computer has final cut pro 5 open most of the time (what I use for work), with photoshop CS, After Effects 6.5 also most of the time (though much less frequently than FCP) and DVD Studio Pro sometimes.
I have FCP's scratch disk set to an external, and DVD Studio pro set to use the same drive than the project, so no idea what's being saved there. FCP's autosave is set on the startup drive, but every 20 mins and the files are so small that I doubt they might account to such a fast space consumption. The autosave folder is about 30 gigs in size now, but hasn't really grown up lately so can't be that either. Also once I found a log file (while searching for files over 1 gig) that was 12 gigs in size, but haven't found any other big one since then, and the folder it was on isn't even 100 megs in size after that, so I'm clueless.

Use Disk Inventory X to find out what is taking your free space.
It might be that a corrupted Log file is running amok and writing to itself repeatedly. Track it down and delete it. The first suspect would be that 12 GB file you mentioned. Log files are typically a few hundred Kb in size. It will not actually harm your system to delete all the log files. They just provide a useful record for when something goes wrong.
Why is your AutoSave folder at 30 GB? You only need those as a fall back in case you mess up the current working project. So long as you are saving your regular project file during and at the end of a session, you don't need the AutoSaves. Even less so those for projects that are long since finished.

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