Incorrect free space reported on FAT32 USB drive

I'm suspecting this is an issue deeper than Finder, but here we go:
I have an 80GB external drive that connects via USB and is formatted FAT32 (for compatibility with my Windows machine and PS3, so this can't change, unfortunately).
The other day, I noticed Finder reporting that only 15GB were available, which didn't seem right. After doing some checks, it is indeed wrong: I've only used 15GB. I've confirmed this with three different tools: Finder itself (using "get info"), the command 'du -csh' while in the drive's directory in /Volumes, and OmniDiskSweeper. All of them agree: only 15GB have been used, on an 80GB drive. Yet it still say it's 15GB free.
So I did a bit more checking. Figuring that I might not have partitioned it correctly, I had a look in fdisk, and the partition spans the whole drive. 'df -h' reports that the partition is 74GB in total, which sounds about right. But df also shows only 15GB remaining. Weird.
Wondering if I'd done an unsafe unmounting, I ran fsck on it, but that turned up nothing (I was hoping for orphaned inodes, but zilch). I know about the 4GB filesize limit on FAT32, and none of my files approach that (the largest being 3GB). I've done some searching online, and haven't found anything useful.
So, anyone heard of anything like this, or have any suggestions that I haven't tried, that aren't "use HFS+ or some other better fs"?
Thanks in advance.

Thanks for the reply. I tried as you suggested (only I made several 4GB files, due to the FAT32 filesize limit). Whenever I encountered the supposed maximum, if I made a file slightly larger than the remaining space (my a megabyte or so), the remaining space would increase by 3GB. After doing this a few times, I tried deleting them (about 25GB-worth), and the free space went back to 15.03GB, as it was before.
Strange...

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Thanks for the reply. I tried as you suggested (only I made several 4GB files, due to the FAT32 filesize limit). Whenever I encountered the supposed maximum, if I made a file slightly larger than the remaining space (my a megabyte or so), the remaining space would increase by 3GB. After doing this a few times, I tried deleting them (about 25GB-worth), and the free space went back to 15.03GB, as it was before.
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Thanks for the reply. I tried as you suggested (only I made several 4GB files, due to the FAT32 filesize limit). Whenever I encountered the supposed maximum, if I made a file slightly larger than the remaining space (my a megabyte or so), the remaining space would increase by 3GB. After doing this a few times, I tried deleting them (about 25GB-worth), and the free space went back to 15.03GB, as it was before.
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Incorrect free space reported on FAT32 USB drive

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