ok ... I did some more thinking and found out more people have this problem. I don't know if this is in any way correct information, or a falsely made link to filesystem properties ... but it's better to try to help
which filesystem are you using? I did some research on google just now and came up with several links to questions about people who have this same problem, or a related one, with ext2. Here's a link about it (in German)
http://www.15bit.de/linux/0421_node5.html
Ext3 doesn't seem to do this flawlessly either