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73416ba
(Get the code!)
This sounds similar to a problem that I experienced yesterday.
I did a fresh installation of Ubuntu 9.04 recently and formatted every partition to ext4. Yesterday, I was moving huge video files from my home directory to a removable USB hard disk (formatted to ext4 as well) when the system froze permanently (i.e. all hard disks stopped running completely). I did this with a couple of my other removable USB hard disks and the same thing happened many times.
The problem can be replicated by copying or moving files within the same IDE hard disk as well. Just a while ago, the system froze when I emptied Trash.
The computer has Windows XP installed, and no such problem problem occurs when I'm running it.
However, as far as I know, I have not experienced any data loss.
With reference to a few of the comments made above, I have more than 40Gb on every partition at any time, so the locking up seems unrelated to the amount of free hard disk space that one has.