hello guys

something strange is happening on my new laptop.
when i give the simple 

# df -m

it gives me negative value for the Used record, as you can
see from the output:

Filesystem   1M-blocks    Used     Avail     Capacity
/dev/wd0a          516          -215      7058548 46% 
/dev/wd0e         8182         4838     2935        62%

what's the matter?